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Outputs (169)

Simultaneous multi-band radio-frequency detection using high-orbital-angular-momentum states in a Rydberg-atom receiver (2024)
Journal Article
Allinson, G., Jamieson, M. J., Mackellar, A. R., Downes, L. A., Adams, C. S., & Weatherill, K. J. (in press). Simultaneous multi-band radio-frequency detection using high-orbital-angular-momentum states in a Rydberg-atom receiver. Physical Review Research,

We demonstrate simultaneous detection of radio-frequency (RF) fields ranging from the very high-frequency (VHF) band (128 MHz) to terahertz frequencies (0.61 THz) using a caesium Rydberg-atom receiver. The RF fields are concurrently applied to a seri... Read More about Simultaneous multi-band radio-frequency detection using high-orbital-angular-momentum states in a Rydberg-atom receiver.

Giant microwave–optical Kerr nonlinearity via Rydberg excitons in cuprous oxide (2024)
Journal Article
Pritchett, J. D., Gallagher, L. A. P., Brewin, A., Wong, H. Q. X., Langbein, W., Lynch, S. A., …Jones, M. P. A. (2024). Giant microwave–optical Kerr nonlinearity via Rydberg excitons in cuprous oxide. APL Photonics, 9(3), Article 031303. https://doi.org/10.1063/5.0192710

Microwave–optical conversion is key to future networks of quantum devices, such as those based on superconducting technology. Conversion at the single quantum level requires strong nonlinearity, high bandwidth, and compatibility with a millikelvin en... Read More about Giant microwave–optical Kerr nonlinearity via Rydberg excitons in cuprous oxide.

Emergence of Synchronization in a Driven-Dissipative Hot Rydberg Vapor (2023)
Journal Article
Wadenpfuhl, K., & Adams, C. S. (2023). Emergence of Synchronization in a Driven-Dissipative Hot Rydberg Vapor. Physical Review Letters, 131(14), Article 143002. https://doi.org/10.1103/PhysRevLett.131.143002

We observe synchronization in a thermal (35-60 °C) atomic (Rb) ensemble driven to a highly excited Rydberg state (principle quantum number n ranging from 43 to 79). Synchronization in this system is unexpected due to the atomic motion; however, we sh... Read More about Emergence of Synchronization in a Driven-Dissipative Hot Rydberg Vapor.

Detection of 3–300 MHz electric fields using Floquet sideband gaps by “Rabi matching” dressed Rydberg atoms (2023)
Journal Article
Rotunno, A. P., Berweger, S., Prajapati, N., Simons, M. T., Artusio-Glimpse, A. B., Holloway, C. L., …Adams, C. (2023). Detection of 3–300 MHz electric fields using Floquet sideband gaps by “Rabi matching” dressed Rydberg atoms. Journal of Applied Physics, 134(13), Article 134501. https://doi.org/10.1063/5.0162101

Radio frequencies in high-frequency (HF) and very high-frequency (VHF) bands (3–300 MHz) are challenging for Rydberg atom-based detection schemes, as resonant detection requires exciting atoms to extremely high energy states. We demonstrate a method... Read More about Detection of 3–300 MHz electric fields using Floquet sideband gaps by “Rabi matching” dressed Rydberg atoms.

Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule (2023)
Journal Article
Guttridge, A., Ruttley, D., Baldock, A., González-Férez, R., Sadeghpour, H., Adams, C., & Cornish, S. (2023). Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule. Physical Review Letters, 131(1), Article 013401. https://doi.org/10.1103/PhysRevLett.131.013401

We demonstrate Rydberg blockade due to the charge-dipole interaction between a single Rb atom and a single RbCs molecule confined in optical tweezers. The molecule is formed by magnetoassociation of a Rb+Cs atom pair and subsequently transferred to t... Read More about Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule.

Universality of Z3 parafermions via edge-mode interaction and quantum simulation of topological space evolution with Rydberg atoms (2023)
Journal Article
Benhemou, A., Angkhanawin, T., Adams, C. S., Browne, D. E., & Pachos, J. K. (2023). Universality of Z3 parafermions via edge-mode interaction and quantum simulation of topological space evolution with Rydberg atoms. Physical Review Research, 5(2), Article 023076. https://doi.org/10.1103/physrevresearch.5.023076

Parafermions are Zn generalizations of Majorana quasiparticles, with fractional non-Abelian statistics. They can be used to encode topological qudits and perform Clifford operations by their braiding. Here we investigate the generation of quantum gat... Read More about Universality of Z3 parafermions via edge-mode interaction and quantum simulation of topological space evolution with Rydberg atoms.

Rapid readout of terahertz orbital angular momentum beams using atom-based imaging (2022)
Journal Article
Downes, L. A., Whiting, D. J., Adams, C. S., & Weatherill, K. J. (2022). Rapid readout of terahertz orbital angular momentum beams using atom-based imaging. Optics Letters, 47(22), 6001-6004. https://doi.org/10.1364/ol.476945

We demonstrate the rapid readout of terahertz orbital angular momentum (OAM) beams using an atomic-vapor-based imaging technique. OAM modes with both azimuthal and radial indices are created using phase-only transmission plates. The beams undergo ter... Read More about Rapid readout of terahertz orbital angular momentum beams using atom-based imaging.

Purcell-enhanced dipolar interactions in nanostructures (2022)
Journal Article
Skljarow, A., Kübler, H., Adams, C., Pfau, T., Löw, R., & Alaeian, H. (2022). Purcell-enhanced dipolar interactions in nanostructures. Physical Review Research, 4(2), https://doi.org/10.1103/physrevresearch.4.023073

Strong light-induced interactions between atoms are known to cause nonlinearities at a few-photon level, which are crucial for applications in quantum information processing. Compared to free space, the scattering and the light-induced dipolar intera... Read More about Purcell-enhanced dipolar interactions in nanostructures.

Terahertz electrometry via infrared spectroscopy of atomic vapor (2022)
Journal Article
Chen, S., Reed, D. J., MacKellar, A. R., Downes, L. A., Almuhawish, N. F., Jamieson, M. J., …Weatherill, K. J. (2022). Terahertz electrometry via infrared spectroscopy of atomic vapor. Optica, 9(5), 485-491. https://doi.org/10.1364/optica.456761

In recent years, the characterisation of radiation falling within the so-called ‘terahertz (THz) gap’ has become an ever more prominent issue due to the increasing use of THz systems in applications such as nondestructive testing, security screening,... Read More about Terahertz electrometry via infrared spectroscopy of atomic vapor.

Transient Density-Induced Dipolar Interactions in a Thin Vapor Cell (2022)
Journal Article
Christaller, F., Mäusezahl, M., Moumtsilis, F., Belz, A., Kübler, H., Alaeian, H., …Pfau, T. (2022). Transient Density-Induced Dipolar Interactions in a Thin Vapor Cell. Physical Review Letters, 128(17), Article 173401. https://doi.org/10.1103/physrevlett.128.173401

We exploit the effect of light-induced atomic desorption to produce high atomic densities (n ≫ k3) in a rubidium vapor cell. An intense off-resonant laser is pulsed for roughly one nanosecond on a micrometersized sapphire-coated cell, which results i... Read More about Transient Density-Induced Dipolar Interactions in a Thin Vapor Cell.

High-resolution nanosecond spectroscopy of even-parity Rydberg excitons in Cu2O (2022)
Journal Article
Rogers, J. P., Gallagher, L. A., Pizzey, D., Pritchett, J. D., Adams, C. S., Jones, M. P., …Lynch, S. A. (2022). High-resolution nanosecond spectroscopy of even-parity Rydberg excitons in Cu2O. Physical Review B, 105(11), Article 115206. https://doi.org/10.1103/physrevb.105.115206

We present a study of even-parity Rydberg exciton states in cuprous oxide using second harmonic generation (SHG) spectroscopy. Excitonic states with principal quantum number n = 5 − 12 were excited by nanosecond pulses around 1143 nm. Using time-reso... Read More about High-resolution nanosecond spectroscopy of even-parity Rydberg excitons in Cu2O.

White-light versus discrete wavelength measurements of Faraday dispersion and the Verdet constant (2021)
Journal Article
Maxwell, J. L., Hughes, I. G., & Adams, C. S. (2022). White-light versus discrete wavelength measurements of Faraday dispersion and the Verdet constant. European Journal of Physics, 43(1), Article 015302. https://doi.org/10.1088/1361-6404/ac31d3

The wavelength dependence of the Faraday effect may be measured either sequentially at particular wavelengths using narrow band sources, or simultaneously at many wavelengths using a white-light or broadband source. We apply both methods to measure t... Read More about White-light versus discrete wavelength measurements of Faraday dispersion and the Verdet constant.

THz electrometry with Rydberg atoms and all IR lasers (2021)
Conference Proceeding
Chen, S., Reed, D., Downes, L. A., MacKellar, A. R., Almuhawish, N. F., Jamieson, M. J., …Weatherill, K. J. (2021). THz electrometry with Rydberg atoms and all IR lasers. In 2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). https://doi.org/10.1109/irmmw-thz50926.2021.9567392

Rydberg electromagnetically induced transparency (EIT) and Autler-Townes (AT) splitting in an atomic vapor cell can be used as novel methods for electric-magnetic field detection. Here we make use of 3 infrared lasers to realize a Rydberg EIT system... Read More about THz electrometry with Rydberg atoms and all IR lasers.

Rydberg excitons in synthetic cuprous oxide Cu2O (2021)
Journal Article
Lynch, S. A., Hodges, C., Mandal, S., Langbein, W., Singh, R. P., Gallagher, L. A., …Jones, M. P. (2021). Rydberg excitons in synthetic cuprous oxide Cu2O. Physical Review Materials, 5(8), Article 084602. https://doi.org/10.1103/physrevmaterials.5.084602

High-lying Rydberg states of Mott-Wannier excitons are receiving considerable interest due to the possibility of adding long-range interactions to the physics of excitons. Here, we study Rydberg excitation in bulk synthetic cuprous oxide grown by the... Read More about Rydberg excitons in synthetic cuprous oxide Cu2O.

Collectively encoded Rydberg qubit (2021)
Journal Article
Spong, N. L., Jiao, Y., Hughes, O. D., Weatherill, K. J., Lesanovsky, I., & Adams, C. S. (2021). Collectively encoded Rydberg qubit. Physical Review Letters, 127(6), Article 063604. https://doi.org/10.1103/physrevlett.127.063604

We demonstrate a collectively-encoded qubit based on a single Rydberg excitation stored in an ensemble of N entangled atoms. Qubit rotations are performed by applying microwave fields that drive excitations between Rydberg states. Coherent read-out i... Read More about Collectively encoded Rydberg qubit.

Collective effects in the photon statistics of thermal atomic ensembles (2021)
Journal Article
Ribeiro, S., Cutler, T. F., Adams, C. S., & Gardiner, S. A. (2021). Collective effects in the photon statistics of thermal atomic ensembles. Physical Review A, 104(1), Article 013719. https://doi.org/10.1103/physreva.104.013719

We investigate the collective scattering of coherent light from a thermal alkali-metal vapor with temperatures ranging from 350 to 450 K, corresponding to average atomic spacings between 0.7 λ and 0.1 λ. We develop a theoretical model treating the at... Read More about Collective effects in the photon statistics of thermal atomic ensembles.

Microwave-optical coupling via Rydberg excitons in cuprous oxide (2021)
Journal Article
Gallagher, L. A., Rogers, J. P., Pritchett, J. D., Mistry, R. A., Pizzey, D., Adams, C. S., …Lynch, S. A. (2022). Microwave-optical coupling via Rydberg excitons in cuprous oxide. Physical Review Research, 4(1), https://doi.org/10.1103/physrevresearch.4.013031

We report exciton-mediated coupling between microwave and optical fields in cuprous oxide (Cu2O) at low temperatures. Rydberg excitonic states with principal quantum number up to n = 12 were observed at 4 K using both one-photon (absorption) and two-... Read More about Microwave-optical coupling via Rydberg excitons in cuprous oxide.

Self-Induced Transparency in Warm and Strongly Interacting Rydberg Gases (2020)
Journal Article
Bai, Z., Adams, C. S., Huang, G., & Li, W. (2020). Self-Induced Transparency in Warm and Strongly Interacting Rydberg Gases. Physical Review Letters, 125(26), Article 263605. https://doi.org/10.1103/physrevlett.125.263605

We study dispersive optical nonlinearities of short pulses propagating in high number density, warm atomic vapors where the laser resonantly excites atoms to Rydberg P states via a single-photon transition. Three different regimes of the light-atom i... Read More about Self-Induced Transparency in Warm and Strongly Interacting Rydberg Gases.

The theoretical potential for large-scale underground thermal energy storage (UTES) within the UK (2020)
Journal Article
Gluyas, J., Adams, C., & Wilson, I. (2020). The theoretical potential for large-scale underground thermal energy storage (UTES) within the UK. Energy Reports, 6(7), 229-237. https://doi.org/10.1016/j.egyr.2020.12.006

Large scale storage of heat is critical for the successful decarbonisation of the UK’s energy mix and for grid-balancing. Heat generation currently accounts for 50% of all energy use in the UK and most of this is produced by burning fossil natural ga... Read More about The theoretical potential for large-scale underground thermal energy storage (UTES) within the UK.

Nanostructured alkali-metal vapor cells (2020)
Journal Article
Cutler, T., Hamlyn, W., Renger, J., Whittaker, K., Pizzey, D., Hughes, I., …Adams, C. (2020). Nanostructured alkali-metal vapor cells. Physical Review Applied, 14(3), Article 034054. https://doi.org/10.1103/physrevapplied.14.034054

Atom-light interactions in micro- and nanoscale systems hold great promise for alternative technologies based on integrated emitters and optical modes. We present the design architecture, construction method, and characterization of an all-glass alka... Read More about Nanostructured alkali-metal vapor cells.

Phase Diagram and Self-Organizing Dynamics in a Thermal Ensemble of Strongly Interacting Rydberg Atoms (2020)
Journal Article
Ding, D., Busche, H., Shi, B., Guo, G., & Adams, C. S. (2020). Phase Diagram and Self-Organizing Dynamics in a Thermal Ensemble of Strongly Interacting Rydberg Atoms. Physical Review X, 10(2), Article 021023. https://doi.org/10.1103/physrevx.10.021023

Far-from-equilibrium dynamics that lead to self-organization are highly relevant to complex dynamical systems not only in physics but also in life, earth, and social sciences. However, it is challenging to find systems with sufficiently controllable... Read More about Phase Diagram and Self-Organizing Dynamics in a Thermal Ensemble of Strongly Interacting Rydberg Atoms.

Photon correlation transients in a weakly blockaded Rydberg ensemble (2020)
Journal Article
Möhl, C., Spong, N. L., Yuechun, J., So, C., Ilieva, T., Weidemüller, M., & Adams, C. S. (2020). Photon correlation transients in a weakly blockaded Rydberg ensemble. Journal of Physics B: Atomic, Molecular and Optical Physics, 53(8), Article 084005. https://doi.org/10.1088/1361-6455/ab728f

The nonlinear and non-local effects in atomic Rydberg media under electromagnetically induced transparency (EIT) make it a versatile platform for fundamental studies and applications in quantum information. In this paper, we study the dynamics of a R... Read More about Photon correlation transients in a weakly blockaded Rydberg ensemble.

Number-resolved imaging of $^{88}$Sr atoms in a long working distance optical tweezer (2020)
Journal Article
Jackson, N., Hanley, R., Hill, M., Leroux, F., Adams, C., & Jones, M. (2020). Number-resolved imaging of $^{88}$Sr atoms in a long working distance optical tweezer. SciPost Physics, 8(3), Article 038. https://doi.org/10.21468/scipostphys.8.3.038

We demonstrate number-resolved detection of individual strontium atoms in a long working distance low numerical aperture (NA = 0.26) tweezer. Using a camera based on single-photon counting technology, we determine the presence of an atom in the tweez... Read More about Number-resolved imaging of $^{88}$Sr atoms in a long working distance optical tweezer.

Optical rotation of white light (2020)
Journal Article
Anderson, J., Gillen, C., Wright, J., Adams, C. S., & Hughes, I. G. (2020). Optical rotation of white light. American Journal of Physics, 88(3), https://doi.org/10.1119/10.0000390

Plane-polarized monochromatic light is rotated in an optically active medium. The extent of the rotation is wavelength dependent, following an optical rotatory dispersion (ORD) curve. Typically, this phenomenon is studied by using a few discrete wave... Read More about Optical rotation of white light.

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor (2020)
Journal Article
Downes, L. A., MacKellar, A. R., Whiting, D. J., Bourgenot, C., Adams, C. S., & Weatherill, K. J. (2020). Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor. Physical Review X, 10(1), Article 011027. https://doi.org/10.1103/physrevx.10.011027

There is much interest in employing terahertz (THz) radiation across a range of imaging applications, but so far, technologies have struggled to achieve the necessary frame rates. Here, we demonstrate a THz imaging system based upon efficient THz-to-... Read More about Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor.

Measuring the Faraday effect in olive oil using permanent magnets and Malus' law (2020)
Journal Article
Carr, D. L., Spong, N. L., Hughes, I. G., & Adams, C. S. (2020). Measuring the Faraday effect in olive oil using permanent magnets and Malus' law. European Journal of Physics, 41(2), Article 025301. https://doi.org/10.1088/1361-6404/ab50dd

We present a simple permanent magnet set-up that can be used to measure the Faraday effect in gases, liquids and solids. By fitting the transmission curve as a function of polarizer angle (Malus' law) we average over short-term fluctuations in the la... Read More about Measuring the Faraday effect in olive oil using permanent magnets and Malus' law.

Quasisimultons in Thermal Atomic Vapors (2019)
Journal Article
Ogden, T. P., Whittaker, K., Keaveney, J., Wrathmall, S., Adams, C., & Potvliege, R. (2019). Quasisimultons in Thermal Atomic Vapors. Physical Review Letters, 123(24), Article 243604. https://doi.org/10.1103/physrevlett.123.243604

The propagation of two-color laser fields through optically thick atomic ensembles is studied. We demonstrate how the interaction between these two fields spawns the formation of copropagating, two-color solitonlike pulses akin to the simultons found... Read More about Quasisimultons in Thermal Atomic Vapors.

Zeeman-tunable modulation transfer spectroscopy (2019)
Journal Article
So, C., Spong, N. L., Möhl, C., Jiao, Y., Ilieva, T., & Adams, C. S. (2019). Zeeman-tunable modulation transfer spectroscopy. Optics Letters, 44(21), 5374-5377. https://doi.org/10.1364/ol.44.005374

Active frequency stabilization of a laser to an atomic or molecular resonance underpins many modern-day AMO physics experiments. With a flat background and high signal-to-noise ratio, modulation transfer spectroscopy (MTS) offers an accurate and stab... Read More about Zeeman-tunable modulation transfer spectroscopy.

Practical designs for permutation-symmetric problem Hamiltonians on hypercubes (2019)
Journal Article
Dodds, A. B., Kendon, V., Adams, C. S., & Chancellor, N. (2019). Practical designs for permutation-symmetric problem Hamiltonians on hypercubes. Physical Review A, 100(3), Article 032320. https://doi.org/10.1103/physreva.100.032320

We present a method to experimentally realize large-scale permutation-symmetric Hamiltonians for continuous-time quantum protocols such as quantum walks and adiabatic quantum computation. In particular, the method can be used to perform an encoded co... Read More about Practical designs for permutation-symmetric problem Hamiltonians on hypercubes.

Measurement of the atom-surface van der Waals interaction by transmission spectroscopy in a wedged nanocell (2019)
Journal Article
Peyrot, T., Šibalić, N., Sortais, Y., Browaeys, A., Sargsyan, A., Sarkisyan, D., …Adams, C. (2019). Measurement of the atom-surface van der Waals interaction by transmission spectroscopy in a wedged nanocell. Physical Review A, 100(2), Article 022503. https://doi.org/10.1103/physreva.100.022503

We demonstrate a method for measuring atom-surface interactions using transmission spectroscopy of thermal vapors confined in a wedged nanocell. The wedged shape of the cell allows complementary measurements of both the bulk atomic vapor and atoms cl... Read More about Measurement of the atom-surface van der Waals interaction by transmission spectroscopy in a wedged nanocell.

Fabrication and characterization of super-polished wedged borosilicate nano-cells (2019)
Journal Article
Peyrot, T., Beurthe, C., Coumar, S., Roulliay, M., Perronet, K., Bonnay, P., …Sortais, Y. (2019). Fabrication and characterization of super-polished wedged borosilicate nano-cells. Optics Letters, 44(8), 1940-1943. https://doi.org/10.1364/ol.44.001940

We report on the fabrication of an all-glass vapor cell with a thickness varying linearly between (exactly) 0 and ∼1  μm. The cell is made in Borofloat glass that allows state-of-the-art super polish roughness, a full optical bonding assembling and e... Read More about Fabrication and characterization of super-polished wedged borosilicate nano-cells.

Optical Transmission of an Atomic Vapor in the Mesoscopic Regime (2019)
Journal Article
Peyrot, T., Sortais, Y., Greffet, J., Browaeys, A., Sargsyan, A., Keaveney, J., …Adams, C. (2019). Optical Transmission of an Atomic Vapor in the Mesoscopic Regime. Physical Review Letters, 122(11), Article 113401. https://doi.org/10.1103/physrevlett.122.113401

By measuring the transmission of near-resonant light through an atomic vapor confined in a nanocell we demonstrate a mesoscopic optical response arising from the nonlocality induced by the motion of atoms with a phase coherence length larger than the... Read More about Optical Transmission of an Atomic Vapor in the Mesoscopic Regime.

Optics f2f (2018)
Book
Adams, C., & Hughes, I. (in press). Optics f2f. OUP

Collective Lamb shift of a nanoscale atomic vapor layer within a sapphire cavity (2018)
Journal Article
Peyrot, T., Keaveney, J., Sortais, Y. R., Sargsyan, A., Sarkisyan, D., Hughes, I. G., …Adams, C. S. (2018). Collective Lamb shift of a nanoscale atomic vapor layer within a sapphire cavity. Physical Review Letters, 120(24), Article 243401. https://doi.org/10.1103/physrevlett.120.243401

We measure the near-resonant transmission of light through a dense medium of potassium vapor confined in a cell with nanometer thickness in order to investigate the origin and validity of the collective Lamb shift. A complete model including the mult... Read More about Collective Lamb shift of a nanoscale atomic vapor layer within a sapphire cavity.

Topological properties of a dense atomic lattice gas (2017)
Journal Article
Bettles, R. J., Minář, J., Adams, C. S., Lesanovsky, I., & Olmos, B. (2017). Topological properties of a dense atomic lattice gas. Physical Review A, 96(4), Article 041603(R). https://doi.org/10.1103/physreva.96.041603

We investigate the existence of topological phases in a dense two-dimensional atomic lattice gas. The coupling of the atoms to the radiation field gives rise to dissipation and a nontrivial coherent long-range exchange interaction whose form goes bey... Read More about Topological properties of a dense atomic lattice gas.

Four-wave mixing in a non-degenerate four-level diamond configuration in the hyperfine Paschen–Back regime (2017)
Journal Article
Whiting, D. J., Mathew, R. S., Keaveney, J., Adams, C. S., & Hughes, I. G. (2018). Four-wave mixing in a non-degenerate four-level diamond configuration in the hyperfine Paschen–Back regime. Journal of Modern Optics, 65(2), 119-128. https://doi.org/10.1080/09500340.2017.1377308

We present an experimental study of seeded four-wave mixing (4WM) using a diamond excitation scheme (with states from the 5S1/2,5P1/2,5P3/25S1/2,5P1/2,5P3/2 and 5D3/25D3/2 terms) in a thermal vapour of 87Rb87Rb atoms. We investigate the 4WM spectra u... Read More about Four-wave mixing in a non-degenerate four-level diamond configuration in the hyperfine Paschen–Back regime.

Single-photon interference due to motion in an atomic collective excitation (2017)
Journal Article
Whiting, D. J., Šibalić, N., Keaveney, J., Adams, C. S., & Hughes, I. G. (2017). Single-photon interference due to motion in an atomic collective excitation. Physical Review Letters, 118(25), Article 253601. https://doi.org/10.1103/physrevlett.118.253601

We experimentally demonstrate the generation of heralded bi-chromatic single photons from an atomic collective spin excitation (CSE). The photon arrival times display collective quantum beats, a novel interference effect resulting from the relative m... Read More about Single-photon interference due to motion in an atomic collective excitation.

Contactless nonlinear optics mediated by long-range Rydberg interactions (2017)
Journal Article
Busche, H., Huillery, P., Ball, S. W., Ilieva, T., Jones, M. P., & Adams, C. S. (2017). Contactless nonlinear optics mediated by long-range Rydberg interactions. Nature Physics, 13(7), 655-658. https://doi.org/10.1038/nphys4058

In conventional nonlinear optics, linear quantum optics1, 2, and cavity quantum electrodynamics3, 4 to create effective photon–photon interactions photons must have, at one time, interacted with matter inside a common medium. In contrast, in Rydberg... Read More about Contactless nonlinear optics mediated by long-range Rydberg interactions.

Cooperative eigenmodes and scattering in one-dimensional atomic arrays (2016)
Journal Article
Bettles, R. J., Gardiner, S. A., & Adams, C. S. (2016). Cooperative eigenmodes and scattering in one-dimensional atomic arrays. Physical Review A, 94(4), Article 043844. https://doi.org/10.1103/physreva.94.043844

Collective coupling between dipoles can dramatically modify the optical response of a medium. Such effects depend strongly on the geometry of the medium and the polarization of the light. Using a classical coupled dipole model, here we investigate th... Read More about Cooperative eigenmodes and scattering in one-dimensional atomic arrays.

Nonlinear quantum optics mediated by Rydberg interactions (2016)
Journal Article
Firstenberg, O., Adams, C., & Hofferberth, S. (2016). Nonlinear quantum optics mediated by Rydberg interactions. Journal of Physics B: Atomic, Molecular and Optical Physics, 49(15), Article 152003. https://doi.org/10.1088/0953-4075/49/15/152003

By mapping the strong interaction between Rydberg excitations in ultra-cold atomic ensembles onto single photons via electromagnetically induced transparency, it is now possible to realize a medium which exhibits a strong optical nonlinearity at the... Read More about Nonlinear quantum optics mediated by Rydberg interactions.

Enhanced optical cross section via collective coupling of atomic dipoles in a 2D array (2016)
Journal Article
Bettles, R. J., Gardiner, S. A., & Adams, C. S. (2016). Enhanced optical cross section via collective coupling of atomic dipoles in a 2D array. Physical Review Letters, 116(10), Article 103602. https://doi.org/10.1103/physrevlett.116.103602

Enhancing the optical cross section is an enticing goal in light-matter interactions, due to its fundamental role in quantum and nonlinear optics. Here, we show how dipolar interactions can suppress off-axis scattering in a two-dimensional atomic arr... Read More about Enhanced optical cross section via collective coupling of atomic dipoles in a 2D array.

Cooperative ordering in lattices of interacting two-level dipoles (2015)
Journal Article
Bettles, R., Gardiner, S., & Adams, C. (2015). Cooperative ordering in lattices of interacting two-level dipoles. Physical Review A, 92(6), Article 063822. https://doi.org/10.1103/physreva.92.063822

We investigate the cooperative behavior of regular monolayers of driven two-level dipoles, using classical electrodynamics simulations. The dipolar response results from the interference of many cooperative eigenmodes, each frequency-shifted from the... Read More about Cooperative ordering in lattices of interacting two-level dipoles.

Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms (2015)
Journal Article
Barredo, D., Labuhn, H., Rayets, S., Lahaye, T., Browaeys, A., & Adams, C. (2015). Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms. Physical Review Letters, 114(11), Article 113002. https://doi.org/10.1103/physrevlett.114.113002

We study coherent excitation hopping in a spin chain realized using highly excited individually addressable Rydberg atoms. The dynamics are fully described in terms of an XY spin Hamiltonian with a long range resonant dipole-dipole coupling that scal... Read More about Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms.

Optical Response of Gas-Phase Atoms at Less than λ/80 from a Dielectric Surface (2014)
Journal Article
Whittaker, K., Keaveney, J., Hughes, I., Sargsyan, A., Sarkisyan, D., & Adams, C. (2014). Optical Response of Gas-Phase Atoms at Less than λ/80 from a Dielectric Surface. Physical Review Letters, 112, Article 253201. https://doi.org/10.1103/physrevlett.112.253201

We present experimental observations of atom-light interactions within tens of nanometers (down to 11 nm) of a sapphire surface. Using photon counting we detect the fluorescence from of order one thousand Rb or Cs atoms, confined in a vapor with thic... Read More about Optical Response of Gas-Phase Atoms at Less than λ/80 from a Dielectric Surface.

Microwave control of the interaction between two optical photons (2014)
Journal Article
Maxwell, D., Szwer, D., Barato, D., Busche, H., Pritchard, J., Gauguet, A., …Adams, C. (2014). Microwave control of the interaction between two optical photons. Physical Review A, 89(4), Article 043827. https://doi.org/10.1103/physreva.89.043827

A microwave field is used to control the interaction between pairs of optical photons stored in highly excited collective states (Rydberg polaritons). We show that strong dipole-dipole interactions induced by the microwave field destroy the coherence... Read More about Microwave control of the interaction between two optical photons.

All-optical quantum information processing using Rydberg gates (2014)
Journal Article
Paredes-Barato, D., & Adams, C. (2014). All-optical quantum information processing using Rydberg gates. Physical Review Letters, 112(4), Article 040501. https://doi.org/10.1103/physrevlett.112.040501

In this Letter, we propose a hybrid scheme to implement a photonic controlled-z (CZ) gate using photon storage in highly excited Rydberg states, which controls the effective photon-photon interaction using resonant microwave fields. Our scheme decoup... Read More about All-optical quantum information processing using Rydberg gates.

Number-resolved imaging of excited-state atoms using a scanning autoionization microscope (2013)
Journal Article
Lochead, G., Boddy, D., Sadler, D., Adams, C., & Jones, M. (2013). Number-resolved imaging of excited-state atoms using a scanning autoionization microscope. Physical Review A, 87(5), Article 053409. https://doi.org/10.1103/physreva.87.053409

We report on a scanning microscopy technique for atom-number-resolved imaging of excited-state atoms. A tightly focused laser beam leads to local autoionization and the resulting ions are counted electronically. Scanning the beam across the cloud bui... Read More about Number-resolved imaging of excited-state atoms using a scanning autoionization microscope.

Storage and Control of Optical Photons Using Rydberg Polaritons (2013)
Journal Article
Maxwell, D., Szwer, D., Paredes-Barato, D., Busche, H., Pritchard, J., Gauguet, A., …Adams, C. (2013). Storage and Control of Optical Photons Using Rydberg Polaritons. Physical Review Letters, 110(10), Article 103001. https://doi.org/10.1103/physrevlett.110.103001

We use a microwave field to control the quantum state of optical photons stored in a cold atomic cloud. The photons are stored in highly excited collective states (Rydberg polaritons) enabling both fast qubit rotations and control of photon-photon in... Read More about Storage and Control of Optical Photons Using Rydberg Polaritons.

Three-photon electromagnetically induced transparency using Rydberg states (2012)
Journal Article
Carr, C., Tanasittikosol, M., Sargsyan, A., Sarkisyan, D., Adams, C., & Weatherill, K. (2012). Three-photon electromagnetically induced transparency using Rydberg states. Optics Letters, 37(18), 3858-3860

We demonstrate electromagnetically induced transparency in a four-level cascade system where the upper level is a Rydberg state. The observed spectral features are sub-Doppler and can be enhanced due to the compensation of Doppler shifts with AC Star... Read More about Three-photon electromagnetically induced transparency using Rydberg states.

Optical preparation and measurement of atomic coherence at gigahertz bandwidth (2012)
Journal Article
Siddons, P., Adams, C., & Hughes, I. (2012). Optical preparation and measurement of atomic coherence at gigahertz bandwidth. Journal of Physics B: Atomic, Molecular and Optical Physics, 45(12), https://doi.org/10.1088/0953-4075/45/12/124009

We detail a method for the preparation of atomic coherence in a high-density atomic vapour of 87Rb, utilizing a coherent preparation scheme of off-resonant gigahertz bandwidth pulses. The scheme is found to be faster and more effective than technique... Read More about Optical preparation and measurement of atomic coherence at gigahertz bandwidth.

Measuring the Stokes parameters for light transmitted by a high-density rubidium vapour in large magnetic fields (2012)
Journal Article
Weller, L., Dalton, T., Siddons, P., Adams, C., & Hughes, I. (2012). Measuring the Stokes parameters for light transmitted by a high-density rubidium vapour in large magnetic fields. Journal of Physics B: Atomic, Molecular and Optical Physics, 45(5), Article 055001. https://doi.org/10.1088/0953-4075/45/5/055001

Here we report on measurements of the absolute absorption and dispersion of light in a dense rubidium vapour on the D2 line in the weak-probe regime with an applied magnetic field. A model for the electric susceptibility of the vapour is presented wh... Read More about Measuring the Stokes parameters for light transmitted by a high-density rubidium vapour in large magnetic fields.

Polarization spectroscopy of an excited state transition (2012)
Journal Article
Carr, C., Adams, C., & Weatherill, K. (2012). Polarization spectroscopy of an excited state transition. Optics Letters, 37(1), 118-120. https://doi.org/10.1364/ol.37.000118

We demonstrate polarization spectroscopy of an excited state transition in room-temperature cesium vapor. An anisotropy induced by a circularly polarized pump beam on the D2 transition is observed using a weak probe on the 6P3/2→7S1/2 transition. At... Read More about Polarization spectroscopy of an excited state transition.

Correlated Photon Emission from Multiatom Rydberg Dark States (2012)
Journal Article
Pritchard, J., Adams, C., & Molmer, K. (2012). Correlated Photon Emission from Multiatom Rydberg Dark States. Physical Review Letters, 108(4), Article 043601. https://doi.org/10.1103/physrevlett.108.043601

We consider three-level atoms driven by two resonant light fields in a ladder scheme where the upper level is a highly excited Rydberg state. We show that the dipole-dipole interactions between Rydberg excited atoms prevents the formation of single p... Read More about Correlated Photon Emission from Multiatom Rydberg Dark States.

Quantum interference in interacting three-level Rydberg gases: coherent population trapping and electromagnetically induced transparency (2011)
Journal Article
Sevincli, S., Ates, C., Pohl, T., Schempp, H., Hofmann, C., Guenter, G., …Adams, C. (2011). Quantum interference in interacting three-level Rydberg gases: coherent population trapping and electromagnetically induced transparency. Journal of Physics B: Atomic, Molecular and Optical Physics, 44, https://doi.org/10.1088/0953-4075/44/18/184018

Absolute absorption on the rubidium D1 line including resonant dipole–dipole interactions (2011)
Journal Article
Weller, L., Bettles, R., Siddons, P., Adams, C., & Hughes, I. (2011). Absolute absorption on the rubidium D1 line including resonant dipole–dipole interactions. Journal of Physics B: Atomic, Molecular and Optical Physics, 44(19), Article 195006. https://doi.org/10.1088/0953-4075/44/19/195006

Here we report on measurements of the absolute absorption spectra of dense rubidium vapour on the D1 line in the weak-probe regime for temperatures up to 170 °C and number densities up to 3 × 1014 cm−3. In such vapours, modifications to the homogeneo... Read More about Absolute absorption on the rubidium D1 line including resonant dipole–dipole interactions.

Magnetic merging of ultracold atomic gases of (85)Rb and (87)Rb (2011)
Journal Article
Haendel, S., Wiles, T., Marchant, A., Hopkins, S., Adams, C., & Cornish, S. (2011). Magnetic merging of ultracold atomic gases of (85)Rb and (87)Rb. Physical Review A, 83(5), Article 053633. https://doi.org/10.1103/physreva.83.053633

We report the magnetic merging of ultracold atomic gases of 85Rb and 87Rb by the controlled overlap of two initially spatially separated magnetic traps. We present a detailed analysis of the combined magnetic-field potential as the two traps are brou... Read More about Magnetic merging of ultracold atomic gases of (85)Rb and (87)Rb.

Off-resonance laser frequency stabilization using the Faraday effect (2011)
Journal Article
Marchant, A. L., Haendel, S., Wiles, T. P., Hopkins, S. A., Adams, C. S., & Cornish, S. L. (2011). Off-resonance laser frequency stabilization using the Faraday effect. Optics Letters, 36(1), 64-66. https://doi.org/10.1364/ol.36.000064

We present a simple technique for stabilization of a laser frequency off resonance using the Faraday effect in a heated vapor cell with an applied magnetic field. In particular, we demonstrate stabilization of a 780nm laser detuned up to 14GHz from t... Read More about Off-resonance laser frequency stabilization using the Faraday effect.

Cooperative Atom-Light Interaction in a Blockaded Rydberg Ensemble (2010)
Journal Article
Pritchard, J., Maxwell, D., Gauguet, A., Weatherill, K., Jones, M., & Adams, C. (2010). Cooperative Atom-Light Interaction in a Blockaded Rydberg Ensemble. Physical Review Letters, 105(19), Article 193603. https://doi.org/10.1103/physrevlett.105.193603

By coupling a probe transition to a Rydberg state using electromagnetically induced transparency (EIT) we map the strong dipole-dipole interactions onto an optical field. We characterize the resulting cooperative optical nonlinearity as a function of... Read More about Cooperative Atom-Light Interaction in a Blockaded Rydberg Ensemble.

Design and characterization of a field-switchable nanomagnetic atom mirror (2010)
Journal Article
Hayward, T., West, A., Weatherill, K., Curran, P., Fry, P., Fundi, P., …Allwood, D. (2010). Design and characterization of a field-switchable nanomagnetic atom mirror. Journal of Applied Physics, 108(4), https://doi.org/10.1063/1.3466995

We present a design for a switchable nanomagnetic atom mirror formed by an array of 180° domain walls confined within Ni80Fe20 planar nanowires. A simple analytical model is developed which allows the magnetic field produced by the domain wall array... Read More about Design and characterization of a field-switchable nanomagnetic atom mirror.

Enhanced electric field sensitivity of rf-dressed Rydberg dark states (2010)
Journal Article
Bason, M., Tanasittikosol, M., Sargsyan, A., Mohapatra, A., Sarkisyan, D., Potvliege, R., & Adams, C. (2010). Enhanced electric field sensitivity of rf-dressed Rydberg dark states. New Journal of Physics, 12, Article 065015. https://doi.org/10.1088/1367-2630/12/6/065015

Optical detection of Rydberg states using electromagnetically induced transparency (EIT) enables continuous measurement of electric fields in a confined geometry. In this paper, we demonstrate the formation of radio frequency (rf)-dressed EIT resonan... Read More about Enhanced electric field sensitivity of rf-dressed Rydberg dark states.

Optical control of Faraday rotation in hot Rb vapor (2010)
Journal Article
Siddons, P., Adams, C., & Hughes, I. (2010). Optical control of Faraday rotation in hot Rb vapor. Physical Review A, 81(4), Article 043838. https://doi.org/10.1103/physreva.81.043838

We demonstrate controlled polarization rotation of an optical field conditional on the presence of a second field. Induced rotations of greater than π/2 rad are seen with a transmission of 95%, corresponding to a ratio of phase shift to absorption of... Read More about Optical control of Faraday rotation in hot Rb vapor.

Off-resonance absorption and dispersion in vapours of hot alkali-metal atoms (2009)
Journal Article
Siddons, P., Adams, C., & Hughes, I. (2009). Off-resonance absorption and dispersion in vapours of hot alkali-metal atoms. Journal of Physics B: Atomic, Molecular and Optical Physics, 42(17), Article 175004. https://doi.org/10.1088/0953-4075/42/17/175004

We study the absorptive and dispersive properties of Doppler-broadened atomic media as a function of detuning. Beginning from the exact lineshape calculated for a two-level atom, a series of approximations to the electric susceptibility are made. The... Read More about Off-resonance absorption and dispersion in vapours of hot alkali-metal atoms.

Bright solitary waves of trapped atomic Bose-Einstein condensates (2009)
Journal Article
Parker, N., Martin, A., Adams, C., & Cornish, S. (2009). Bright solitary waves of trapped atomic Bose-Einstein condensates. Physica D: Nonlinear Phenomena, 238(15), 1456-1461. https://doi.org/10.1016/j.physd.2008.07.001

Motivated by recent experimental observations, we study theoretically multiple bright solitary waves of trapped Bose–Einstein condensates. Through variational and numerical analyses, we determine the threshold for collapse of these states. Under π-ph... Read More about Bright solitary waves of trapped atomic Bose-Einstein condensates.

A gigahertz-bandwidth atomic probe based on the slow-light Faraday effect (2009)
Journal Article
Siddons, P., Bell, N., Cai, Y., Adams, C., & Hughes, I. (2009). A gigahertz-bandwidth atomic probe based on the slow-light Faraday effect. Nature Photonics, 3(4), 225-229. https://doi.org/10.1038/nphoton.2009.27

The ability to probe quantum systems on short timescales is central to the advancement of quantum technology. Here we show that this is possible using an off-resonant dispersive probe. By applying a magnetic field to an atomic vapour the spectra of t... Read More about A gigahertz-bandwidth atomic probe based on the slow-light Faraday effect.

Laser frequency stabilization to excited state transitions using electromagnetically induced transparency in a cascade system (2009)
Journal Article
Abel, R., Mohapatra, A., Bason, M., Pritchard, J., Weatherill, K., Raitzsch, U., & Adams, C. (2009). Laser frequency stabilization to excited state transitions using electromagnetically induced transparency in a cascade system. Applied Physics Letters, 94(7), Article 071107. https://doi.org/10.1063/1.3086305

We demonstrate laser frequency stabilization to excited state transitions using cascade electromagnetically induced transparency. Using a room temperature Rb vapor cell as a reference, we stabilize a first diode laser to the D2 transition and a secon... Read More about Laser frequency stabilization to excited state transitions using electromagnetically induced transparency in a cascade system.

A versatile and reliably re-usable ultra-high vacuum viewport (2009)
Journal Article
Weatherill, K., Pritchard, J., Griffin, P., Dammalapati, U., Adams, C., & Riis, E. (2009). A versatile and reliably re-usable ultra-high vacuum viewport. Review of Scientific Instruments, 80(2), https://doi.org/10.1063/1.3075547

We present a viewport for use in ultrahigh vacuum (UHV) based upon the preflattened solder seal design presented in earlier work [ Cox et al., Rev. Sci. Instrum. 74, 3185 (2003) ]. The design features significant modifications to improve long term pe... Read More about A versatile and reliably re-usable ultra-high vacuum viewport.

Quantum reflection of bright matter-wave solitons (2009)
Journal Article
Cornish, S., Parker, N., Martin, A., Judd, T., Scott, R., Fromhold, T., & Adams, C. (2009). Quantum reflection of bright matter-wave solitons. Physica D: Nonlinear Phenomena, 238(15), 1299-1305. https://doi.org/10.1016/j.physd.2008.07.011

We propose the use of bright matter-wave solitons formed from Bose–Einstein condensates with attractive interactions to probe and study quantum reflection from a solid surface at normal incidence. We demonstrate that the presence of attractive intera... Read More about Quantum reflection of bright matter-wave solitons.

A vapor cell based on dispensers for laser spectroscopy (2009)
Journal Article
Bridge, E., Millen, J., Adams, C., & Jones, M. (2009). A vapor cell based on dispensers for laser spectroscopy. Review of Scientific Instruments, 80(1), Article 013101. https://doi.org/10.1063/1.3036980

We describe a simple strontium vapor cell for laser spectroscopy experiments. Strontium vapor is produced using an electrically heated commercial dispenser source. The sealed cell operates at room temperature, and without a buffer gas or vacuum pump.... Read More about A vapor cell based on dispensers for laser spectroscopy.

Narrow absorptive resonances in a four-level atomic system (2009)
Journal Article
Bason, M., Mohapatra, A., Weatherill, K., & Adams, C. (2009). Narrow absorptive resonances in a four-level atomic system. Journal of Physics B: Atomic, Molecular and Optical Physics, 42(7), https://doi.org/10.1088/0953-4075/42/7/075503

We study the effect of a control beam on a Λ electromagnetically induced transparency (EIT) system in 87Rb. The control beam couples one ground state to another excited state forming a four-level -system. Phase coherent laser beams to drive the -syst... Read More about Narrow absorptive resonances in a four-level atomic system.

A giant electro-optic effect using polarizable dark states (2008)
Journal Article
Mohapatra, A., Bason, M., Butscher, B., Weatherill, K., & Adams, C. (2008). A giant electro-optic effect using polarizable dark states. Nature Physics, 4(11), 890-894. https://doi.org/10.1038/nphys1091

The electro-optic effect, where the refractive index of a medium is modified by an electric field, is of central importance in nonlinear optics, laser technology, quantum optics and optical communications. In general, electro-optic coefficients are v... Read More about A giant electro-optic effect using polarizable dark states.

Electro-optic control of atom-light interactions using Rydberg dark-state polaritons (2008)
Journal Article
Bason, M., Mohapatra, A., Weatherill, K., & Adams, C. (2008). Electro-optic control of atom-light interactions using Rydberg dark-state polaritons. Physical Review A, 77(3), https://doi.org/10.1103/physreva.77.032305

We demonstrate a multiphoton Rydberg dark resonance where a Λ system is coupled to a Rydberg state. This N-type level scheme combines the ability to slow and store light pulses associated with long-lived ground-state superpositions with the strongly... Read More about Electro-optic control of atom-light interactions using Rydberg dark-state polaritons.

Absolute absorption on rubidium D lines: comparison between theory and experiment (2008)
Journal Article
Siddons, P., Adams, C., Ge, C., & Hughes, I. (2008). Absolute absorption on rubidium D lines: comparison between theory and experiment. Journal of Physics B: Atomic, Molecular and Optical Physics, 41(15), Article 155004. https://doi.org/10.1088/0953-4075/41/15/155004

We study the Doppler-broadened absorption of a weak monochromatic probe beam in a thermal rubidium vapour cell on D lines. A detailed model of the susceptibility is developed which takes into account the absolute linestrengths of the allowed electric... Read More about Absolute absorption on rubidium D lines: comparison between theory and experiment.

Collisions of bright solitary matter waves (2008)
Journal Article
Parker, N., Martin, A., Cornish, S., & Adams, C. (2008). Collisions of bright solitary matter waves. Journal of Physics B: Atomic, Molecular and Optical Physics, 41(4), Article 045303. https://doi.org/10.1088/0953-4075/41/4/045303

The collisions of three-dimensional bright solitary matter waves formed from atomic Bose–Einstein condensates are shown to exhibit rich behaviour. Collisions range from being elastic to completely destructive due to the onset of collapse during the i... Read More about Collisions of bright solitary matter waves.

Electromagnetically induced transparency of an interacting cold Rydberg ensemble (2008)
Journal Article
Weatherill, K., Pritchard, J., Abel, R., Bason, M., Mohapatra, A., & Adams, C. (2008). Electromagnetically induced transparency of an interacting cold Rydberg ensemble. Journal of Physics B: Atomic, Molecular and Optical Physics, 41(20), Article 201002. https://doi.org/10.1088/0953-4075/41/20/201002

We study electromagnetically induced transparency (EIT) of a weakly interacting cold Rydberg gas. We show that for Rydberg states with principal quantum numbers in the range n = 19–26, the onset of interactions is manifest as a depopulation of the Ry... Read More about Electromagnetically induced transparency of an interacting cold Rydberg ensemble.

Bright solitary-matter-wave collisions in a harmonic trap: Regimes of solitonlike behavior (2008)
Journal Article
Martin, A., Adams, C., & Gardiner, S. (2008). Bright solitary-matter-wave collisions in a harmonic trap: Regimes of solitonlike behavior. Physical Review A, 77(1), https://doi.org/10.1103/physreva.77.013620

Systems of solitary waves in the one-dimensional Gross-Pitaevskii equation, which models a trapped atomic Bose-Einstein condensate, are investigated theoretically. To analyze the soliton nature of these solitary waves, a particle analogy for the soli... Read More about Bright solitary-matter-wave collisions in a harmonic trap: Regimes of solitonlike behavior.

Coherent optical detection of highly excited Rydberg states using electromagnetically induced transparency (2007)
Journal Article
Mohapatra, A., Jackson, T., & Adams, C. (2007). Coherent optical detection of highly excited Rydberg states using electromagnetically induced transparency. Physical Review Letters, 98, https://doi.org/10.1103/physrevlett.98.113003

We demonstrate coherent optical detection of highly excited Rydberg states (up to n=124) using electromagnetically induced transparency (EIT), providing a direct nondestructive probe of Rydberg energy levels. We show that the EIT spectra allow direct... Read More about Coherent optical detection of highly excited Rydberg states using electromagnetically induced transparency.

Bright matter-wave soliton collisions in a harmonic trap : regular and chaotic dynamics (2007)
Journal Article
Martin, A., Adams, C., & Gardiner, S. (2007). Bright matter-wave soliton collisions in a harmonic trap : regular and chaotic dynamics. Physical Review Letters, 98(2), https://doi.org/10.1103/physrevlett.98.020402

Collisions between bright solitary waves in the 1D Gross-Pitaevskii equation with a harmonic potential, which models a trapped atomic Bose-Einstein condensate, are investigated theoretically. A particle analogy for the solitary waves is formulated an... Read More about Bright matter-wave soliton collisions in a harmonic trap : regular and chaotic dynamics.

Sagnac interferometry in a slow-light medium (2006)
Journal Article
Purves, G., Adams, C., & Hughes, I. (2006). Sagnac interferometry in a slow-light medium. Physical Review A, 74, https://doi.org/10.1103/physreva.74.023805

We use a Sagnac interferometer to measure the dispersive and absorptive properties of room temperature Rubidium vapor on the D2 line at 780.2 nm. We apply a pump beam such that the resulting system exhibits electromagnetically induced transparency. U... Read More about Sagnac interferometry in a slow-light medium.

Mobile atom traps using magnetic nanowires (2006)
Journal Article
Allwood, D., Schrefl, T., Hrkac, G., Hughes, I., & Adams, C. (2006). Mobile atom traps using magnetic nanowires. Applied Physics Letters, 89(1), https://doi.org/10.1063/1.2219397

By solving the Landau-Lifshitz-Gilbert equation using a finite element method we show that an atom trap can be produced above a ferromagnetic nanowire domain wall. Atoms experience trap frequencies of up to a few megahertz, and can be transported by... Read More about Mobile atom traps using magnetic nanowires.

Spatially selective loading of an optical lattice by light-shift engineering using an auxiliary laser field (2006)
Journal Article
Griffin, P., Weatherill, K., MacLeod, S., Potvliege, R., & Adams, C. (2006). Spatially selective loading of an optical lattice by light-shift engineering using an auxiliary laser field. New Journal of Physics, 8(11), https://doi.org/10.1088/1367-2630/8/1/011

I had the idea a long time ago that shifting the excited state energy level using an additional laser could be a useful tool in cold atoms experiments. In this paper we demonstrated experimentally the application of this idea to loading specific site... Read More about Spatially selective loading of an optical lattice by light-shift engineering using an auxiliary laser field.

Loading of selected sites in an optical lattice using light-shift engineering (2005)
Conference Proceeding
Griffin, P., Weatherill, K., Macleod, S., Potvliege, R., & Adams, C. (2005). Loading of selected sites in an optical lattice using light-shift engineering. In E. Hinds, A. Ferguson, & E. Riis (Eds.), Laser spectroscopy : XVII International Conference of Laser Spectroscopy ; proceedings (307-314). https://doi.org/10.1142/9789812701473_0032

We report on a method of light–shift engineering where an additional laser is used to tune the energy of an excited atomic state. We show that the technique can be used to enhance the loading of a deep optical lattice or selectively load specific sit... Read More about Loading of selected sites in an optical lattice using light-shift engineering.

Emergence and decay of turbulence in stirred atomic Bose-Einstein condensates (2005)
Journal Article
Parker, N., & Adams, C. (2005). Emergence and decay of turbulence in stirred atomic Bose-Einstein condensates. Physical Review Letters, 95(14), https://doi.org/10.1103/physrevlett.95.145301

We show that a ``weak'' elliptical deformation of an atomic Bose-Einstein condensate rotating at close to the quadrupole instability frequency leads to turbulence with a Kolmogorov energy spectrum. The turbulent state is produced by energy transfer t... Read More about Emergence and decay of turbulence in stirred atomic Bose-Einstein condensates.

Tunnelling induced collapse of an atomic Bose–Einstein condensate in a double-well potential. (2004)
Journal Article
Sakellari, E., Proukakis, N., & Adams, C. (2004). Tunnelling induced collapse of an atomic Bose–Einstein condensate in a double-well potential. Journal of Physics B: Atomic, Molecular and Optical Physics, 37(18), 3681-3690. https://doi.org/10.1088/0953-4075/37/18/009

The stability of a low-temperature Bose–Einstein condensate with attractive interactions in one- and three-dimensional double-well potentials is discussed. In particular, the tunnelling dynamics of a condensate under the influence of a time-dependent... Read More about Tunnelling induced collapse of an atomic Bose–Einstein condensate in a double-well potential..

Controlled vortex-sound interactions in atomic Bose-Einstein condensate (2004)
Journal Article
Parker, N., Proukakis, N., Barenghi, C., & Adams, C. (2004). Controlled vortex-sound interactions in atomic Bose-Einstein condensate. Physical Review Letters, 92(16), https://doi.org/10.1103/physrevlett.92.160403

The low temperature dynamics of a vortex in a trapped quasi-two-dimensional Bose-Einstein condensate are studied quantitatively. Precession of an off-centered vortex in a dimple trap, embedded in a weaker harmonic trap, leads to the emission of sound... Read More about Controlled vortex-sound interactions in atomic Bose-Einstein condensate.

Josephson tunnelling of a phase-imprinted Bose-Einstein condensate in a time-dependent double-well potential (2004)
Journal Article
Sakellari, E., Proukakis, N., Leadbeater, M., & Adams, C. (2004). Josephson tunnelling of a phase-imprinted Bose-Einstein condensate in a time-dependent double-well potential. New Journal of Physics, 6, Article 42. https://doi.org/10.1088/1367-2630/6/1/042

This paper discusses the feasibility of experimental control of the flow direction of atomic Bose–Einstein condensates in a double-well potential using phase imprinting. The flow is induced by the application of a time-dependent potential gradient, p... Read More about Josephson tunnelling of a phase-imprinted Bose-Einstein condensate in a time-dependent double-well potential.

Non-linear Sagnac interferometry for pump-probe dispersion spectroscopy (2003)
Journal Article
Jundt, G., Purves, G., Adams, C., & Hughes, I. (2003). Non-linear Sagnac interferometry for pump-probe dispersion spectroscopy. The European Physical Journal D, 27(3), 273-276. https://doi.org/10.1140/epjd/e2003-00275-5

We explore pump-probe non-linear Sagnac interferometry as a tool to measure the dispersive properties of a medium. We introduce the background theory, and show experimental spectra obtained on the D2 transition with 85Rb and 87Rb. The measured disper... Read More about Non-linear Sagnac interferometry for pump-probe dispersion spectroscopy.

Soliton-sound interactions in quasi-one-dimensional Bose-Einstein condensates (2003)
Journal Article
Parker, N., Proukakis, N., Leadbeater, M., & Adams, C. (2003). Soliton-sound interactions in quasi-one-dimensional Bose-Einstein condensates. Physical Review Letters, 90(22), https://doi.org/10.1103/physrevlett.90.220401

Longitudinal confinement of dark solitons in quasi-one-dimensional Bose-Einstein condensates leads to sound emission and reabsorption.We perform quantitative studies of the dynamics of a soliton oscillating in a tight dimple trap, embedded in a weake... Read More about Soliton-sound interactions in quasi-one-dimensional Bose-Einstein condensates.

Deformation of dark solitons in inhomogeneous Bose–Einstein condensates. (2003)
Journal Article
Parker, N., Proukakis, N., Leadbeater, M., & Adams, C. (2003). Deformation of dark solitons in inhomogeneous Bose–Einstein condensates. Journal of Physics B: Atomic, Molecular and Optical Physics, 36(13), 2891-2910. https://doi.org/10.1088/0953-4075/36/13/318

A dark soliton becomes unstable when it is incident on a background density gradient, and the induced instability results in the emission of sound. Detailed quantitative studies of sound emission are performed for various potentials, such as steps, l... Read More about Deformation of dark solitons in inhomogeneous Bose–Einstein condensates..

Laser cooling of calcium in a 'golden ratio' quasi-electrostatic lattice (2003)
Journal Article
Adams, C., Cox, S., Riis, E., & Arnold, A. (2003). Laser cooling of calcium in a 'golden ratio' quasi-electrostatic lattice. Journal of Physics B: Atomic, Molecular and Optical Physics, 36(10), 1933-1942. https://doi.org/10.1088/0953-4075/36/10/304

A 3D lattice based on a high-power CO2 laser is considered in the context of laser cooling and trapping of atomic calcium. We expect to be able to realize a system with >10 000 lattice sites each with more than 100 atoms, and the facility to laser co... Read More about Laser cooling of calcium in a 'golden ratio' quasi-electrostatic lattice.

Polarization spectroscopy of a closed atomic transition: applications to laser frequency locking (2002)
Journal Article
Pearman, C., Adams, C., Cox, S., Griffin, P., Smith, D., & Hughes, I. (2002). Polarization spectroscopy of a closed atomic transition: applications to laser frequency locking. Journal of Physics B: Atomic, Molecular and Optical Physics, 35(24), 5141-5151. https://doi.org/10.1088/0953-4075/35/24/315

We study polarization spectroscopy of Rb vapour. A weak probe beam analyses the birefringence induced in a room temperature vapour by a strong counterpropagating circularly polarized pump beam. In contrast to most other work on polarization spectrosc... Read More about Polarization spectroscopy of a closed atomic transition: applications to laser frequency locking.

A Fast Semi-Implicit Finite-Difference Method for the TDGL Equations (2002)
Journal Article
Winiecki, T., & Adams, C. (2002). A Fast Semi-Implicit Finite-Difference Method for the TDGL Equations. Journal of Computational Physics, 179(1), 127-139. https://doi.org/10.1006/jcph.2002.7047

We propose a finite-difference algorithm for solving the time-dependent Ginzburg–Landau (TDGL) equation coupled to the appropriate Maxwell equation. The time derivatives are discretized using a second-order semi-implicit scheme which, for intermediat... Read More about A Fast Semi-Implicit Finite-Difference Method for the TDGL Equations.

Motion of Objects Through Dilute Bose-Einstein Condensates (2001)
Book Chapter
Adams, C., Jackson, B., Leadbeater, M., McCann, J., & Winiecki, T. (2001). Motion of Objects Through Dilute Bose-Einstein Condensates. In C. Barenghi, R. Donnelly, & W. Vinen (Eds.), Quantized Vortex Dynamics and Superfluid Turbulence (307-). Springer Verlag

Hyperfine effects in electromagnetically induced transparency. (2001)
Journal Article
Badger, S., Hughes, I., & Adams, C. (2001). Hyperfine effects in electromagnetically induced transparency. Journal of Physics B: Atomic, Molecular and Optical Physics, 34(22), L749-L756. https://doi.org/10.1088/0953-4075/34/22/107

The role of hyperfine structure in electromagnetically induced transparency (EIT) is investigated by studying the 5S1/2-5P3/2-5D3/2,5/2 cascade system in 85Rb and 87Rb. We show that if the hyperfine splitting Δhfs is larger than the Rabi frequency of... Read More about Hyperfine effects in electromagnetically induced transparency..

Sound emission due to superfluid vortex reconnections (2001)
Journal Article
Leadbeater, M., Winiecki, T., Samuels, D., Barenghi, C., & Adams, C. (2001). Sound emission due to superfluid vortex reconnections. Physical Review Letters, 86(8), 1410-1413. https://doi.org/10.1103/physrevlett.86.1410

By performing numerical simulations based on the Gross-Pitaevskii equation, we make direct quantitative measurements of the sound energy released due to superfluid vortex reconnections. We show that the energy radiated expressed in terms of the loss... Read More about Sound emission due to superfluid vortex reconnections.

Evaporative Cooling In A Crossed Dipole Trap (1995)
Journal Article
Adams, C., Lee, H., Davidson, N., Kasevich, M., & Chu, S. (1995). Evaporative Cooling In A Crossed Dipole Trap. Physical Review Letters, 74, 3577-3580

Atom Optics. (1994)
Journal Article
Adams, C. (1994). Atom Optics. Contemporary Physics, 35(1), 1-19. https://doi.org/10.1080/00107519408217492

The field of atom optics has enjoyed a surge of interest in recent years because of the production of microstructures sufficiently fine to diffract atomic beams through significant angles, and the development of tunable narrow-linewidth lasers that c... Read More about Atom Optics..