Outputs (786)

Difference-frequency combs in cold atom physics (2016)
Journal Article
Kliese, R., Hoghooghi, N., Puppe, T., Rohde, F., Sell, A., Zach, A., …Jones, M. (2016). Difference-frequency combs in cold atom physics. European Physical Journal - Special Topics, 225(15), 2775-2784. https://doi.org/10.1140/epjst/e2016-60092-0

Optical frequency combs provide the clockwork to relate optical frequencies to radio frequencies. Hence, combs allow optical frequencies to be measured with respect to a radio frequency where the accuracy is limited only by the reference signal. In o... Read More about Difference-frequency combs in cold atom physics.

epsilon-pseudoclassical model for quantum resonances in a cold dilute atomic gas periodically driven by finite-duration standing-wave laser pulses (2016)
Journal Article
Beswick, B., Hughes, I., Gardiner, S., Astier, H., Andersen, M., & Daszuta, B. (2016). epsilon-pseudoclassical model for quantum resonances in a cold dilute atomic gas periodically driven by finite-duration standing-wave laser pulses. Physical Review A, 94(6), Article 063604. https://doi.org/10.1103/physreva.94.063604

Atom interferometers are a useful tool for precision measurements of fundamental physical phenomena, ranging from the local gravitational-field strength to the atomic fine-structure constant. In such experiments, it is desirable to implement a high-m... Read More about epsilon-pseudoclassical model for quantum resonances in a cold dilute atomic gas periodically driven by finite-duration standing-wave laser pulses.

Progress towards quantum-enhanced interferometry with harmonically trapped quantum matter-wave bright solitons (2016)
Journal Article
Gertjerenken, B., Wiles, T., & Weiss, C. (2016). Progress towards quantum-enhanced interferometry with harmonically trapped quantum matter-wave bright solitons. Physical Review A, 94(5), Article 053638. https://doi.org/10.1103/physreva.94.053638

We model the dynamics of attractively interacting ultracold bosonic atoms in a quasi-one-dimensional wave guide with additional harmonic trapping. Initially, we prepare the system in its ground state and then shift the zero of the harmonic trap and s... Read More about Progress towards quantum-enhanced interferometry with harmonically trapped quantum matter-wave bright solitons.

A Direct Mapping of Max k-SAT and High Order Parity Checks to a Chimera Graph (2016)
Journal Article
Chancellor, N., Zohren, S., Warburton, P., Benjamin, S., & Roberts, S. (2016). A Direct Mapping of Max k-SAT and High Order Parity Checks to a Chimera Graph. Scientific Reports, 6, Article 37107. https://doi.org/10.1038/srep37107

We demonstrate a direct mapping of max k-SAT problems (and weighted max k-SAT) to a Chimera graph, which is the non-planar hardware graph of the devices built by D-Wave Systems Inc. We further show that this mapping can be used to map a similar class... Read More about A Direct Mapping of Max k-SAT and High Order Parity Checks to a Chimera Graph.

Real-Time Near-Field Terahertz Imaging with Atomic Optical Fluorescence (2016)
Journal Article
Wade, C., Šibalić, N., De Melo, N., Kondo, J., Adams, C., & Weatherill, K. (2017). Real-Time Near-Field Terahertz Imaging with Atomic Optical Fluorescence. Nature Photonics, 11(1), 40-43. https://doi.org/10.1038/nphoton.2016.214

Terahertz (THz) near-field imaging is a flourishing discipline, with applications from fundamental studies of beam propagation to the characterization of metamaterials, and waveguides. Beating the diffraction limit typically involves rastering struct... Read More about Real-Time Near-Field Terahertz Imaging with Atomic Optical Fluorescence.

Controlling the rotational and hyperfine state of ultracold Rb87Cs133 molecules (2016)
Journal Article
Gregory, P. D., Aldegunde, J., Hutson, J. M., & Cornish, S. L. (2016). Controlling the rotational and hyperfine state of ultracold Rb87Cs133 molecules. Physical Review Letters, 94(4), Article 041403(R). https://doi.org/10.1103/physreva.94.041403

We demonstrate coherent control of the rotational and hyperfine state of ultracold, chemically stable Rb87Cs133 molecules with external microwave fields. We create a sample of ∼2000 molecules in the lowest hyperfine level of the rovibronic ground sta... Read More about Controlling the rotational and hyperfine state of ultracold Rb87Cs133 molecules.

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.

Grand-canonical condensate fluctuations in weakly interacting Bose-Einstein condensates of light (2016)
Journal Article
Weiss, C., & Tempere, J. (2016). Grand-canonical condensate fluctuations in weakly interacting Bose-Einstein condensates of light. Physical Review E, 94(4), Article 042124. https://doi.org/10.1103/physreve.94.042124

Grand-canonical fluctuations of Bose-Einstein condensates of light are accessible to state-of-the-art experiments [J. Schmitt et al., Phys. Rev. Lett. 112, 030401 (2014).]. We phenomenologically describe these fluctuations by using the grand-canonica... Read More about Grand-canonical condensate fluctuations in weakly interacting Bose-Einstein condensates of light.

Production of ultracold 87Rb133Cs in the absolute ground state: complete characterisation of the STIRAP transfer (2016)
Journal Article
Molony, P. K., Gregory, P. D., Kumar, A., Le Sueur, C. R., Hutson, J. M., & Cornish, S. L. (2016). Production of ultracold 87Rb133Cs in the absolute ground state: complete characterisation of the STIRAP transfer. ChemPhysChem, 17(22), 3811-3817. https://doi.org/10.1002/cphc.201600501

We present the production of ultracold 87 RbCs molecules in the electronic, rovibrational and hyperfine ground state, using stimulated Raman adiabatic passage to transfer the molecules from a weakly bound Feshbach state. We measure one-way transfer e... Read More about Production of ultracold 87Rb133Cs in the absolute ground state: complete characterisation of the STIRAP transfer.

Center-of-mass motion as a sensitive convergence test for variational multimode quantum dynamics (2016)
Journal Article
Cosme, J., Weiss, C., & Brand, J. (2016). Center-of-mass motion as a sensitive convergence test for variational multimode quantum dynamics. Physical Review A, 94(4), Article 043603. https://doi.org/10.1103/physreva.94.043603

Multimode expansions in computational quantum dynamics promise convergence toward exact results upon increasing the number of modes. Convergence is difficult to ascertain in practice due to the unfavorable scaling of required resources for many-parti... Read More about Center-of-mass motion as a sensitive convergence test for variational multimode quantum dynamics.

A single-mode external cavity diode laser using an intra-cavity atomic Faraday filter with short-term linewidth <400 kHz and long-term stability of <1 MHz (2016)
Journal Article
Keaveney, J., Hamlyn, W. J., Adams, C. S., & Hughes, I. G. (2016). A single-mode external cavity diode laser using an intra-cavity atomic Faraday filter with short-term linewidth

We report on the development of a diode laser system - the “Faraday laser” - using an atomic Faraday filter as the frequency-selective element. In contrast to typical external-cavity diode laser systems which offer tunable output frequency but requir... Read More about A single-mode external cavity diode laser using an intra-cavity atomic Faraday filter with short-term linewidth <400 kHz and long-term stability of <1 MHz.

Dressed-state electromagnetically induced transparency for light storage in uniform-phase spin waves (2016)
Journal Article
Šibalić, N., Kondo, J., Adams, C., & Weatherill, K. (2016). Dressed-state electromagnetically induced transparency for light storage in uniform-phase spin waves. Physical Review A, 94(3), Article 033840. https://doi.org/10.1103/physreva.94.033840

We present, experimentally and theoretically, a scheme for dressed-state electromagnetically induced transparency (EIT) in a three-step cascade system in which a four-level system is mapped into an effective three-level system. Theoretical analysis r... Read More about Dressed-state electromagnetically induced transparency for light storage in uniform-phase spin waves.

Measurement of the binding energy of ultracold 87Rb133Cs molecules using an offset-free optical frequency comb (2016)
Journal Article
Molony, P. . K., Kumar, A., Gregory, P. . D., Kliese, R., Puppe, T., Le Sueur, C. . R., Aldegunde, J., Hutson, J. . M., & Cornish, S. . L. (2016). Measurement of the binding energy of ultracold 87Rb133Cs molecules using an offset-free optical frequency comb. Physical Review A, 94(2), Article 022507. https://doi.org/10.1103/physreva.94.022507

We report the binding energy of Rb87Cs133 molecules in their rovibrational ground state measured using an offset-free optical frequency comb based on difference frequency generation technology. We create molecules in the absolute ground state using s... Read More about Measurement of the binding energy of ultracold 87Rb133Cs molecules using an offset-free optical frequency comb.

Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions (2016)
Journal Article
Šibalić, N., Wade, C., Adams, C., Weatherill, K., & Pohl, T. (2016). Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions. Physical Review A, 94(1), Article 011401. https://doi.org/10.1103/physreva.94.011401

We investigate the nonequilibrium dynamics of a driven-dissipative spin ensemble with competing power-law interactions. We demonstrate that dynamical phase transitions as well as bistabilities can emerge for asymptotic van der Waals interactions, but... Read More about Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions.

Intrinsic Optical Bistability in a Strongly-Driven Rydberg Ensemble (2016)
Journal Article
de Melo, N. R., Wade, C. G., Šibalić, N., Kondo, J. M., Adams, C. S., & Weatherill, K. J. (2016). Intrinsic Optical Bistability in a Strongly-Driven Rydberg Ensemble. Physical Review A, 93(6), Article 063863. https://doi.org/10.1103/physreva.93.063863

We observe and characterize intrinsic optical bistability in a dilute Rydberg vapor. The bistability is characterized by sharp jumps between states of low and high Rydberg occupancy with jump-up and -down positions displaying hysteresis depending on... Read More about Intrinsic Optical Bistability in a Strongly-Driven Rydberg Ensemble.

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.

Direct loading of a large Yb MOT on the 1S0 → 3P1 transition (2016)
Journal Article
Guttridge, A., Hopkins, S., Kemp, S., Boddy, D., Freytag, R., Jones, M., …Cornish, S. (2016). Direct loading of a large Yb MOT on the 1S0 → 3P1 transition. Journal of Physics B: Atomic, Molecular and Optical Physics, 49(14), Article 145006. https://doi.org/10.1088/0953-4075/49/14/145006

We report a robust technique for laser frequency stabilisation that enables the reproducible loading of in excess of 109 Yb atoms from a Zeeman slower directly into a magneto-optical trap (MOT) operating on the 1S0 → 3P1 transition, without the need... Read More about Direct loading of a large Yb MOT on the 1S0 → 3P1 transition.

Excitation of knotted vortex lines in matter waves (2016)
Journal Article
Maucher, F., Gardiner, S., & Hughes, I. (2016). Excitation of knotted vortex lines in matter waves. New Journal of Physics, 18(6), Article 063016. https://doi.org/10.1088/1367-2630/18/6/063016

We study the creation of knotted ultracold matter waves in Bose–Einstein condensates via coherent two-photon Raman transitions with a Λ level configuration. The Raman transition allows an indirect transfer of atoms from the internal state $| a\rangle... Read More about Excitation of knotted vortex lines in matter waves.

Direct measurement of excited-state dipole matrix elements using electromagnetically induced transparency in the hyperfine Paschen-Back regime (2016)
Journal Article
Whiting, D., Keaveney, J., Adams, C., & Hughes, I. (2016). Direct measurement of excited-state dipole matrix elements using electromagnetically induced transparency in the hyperfine Paschen-Back regime. Physical Review A, 93(4), Article 043854. https://doi.org/10.1103/physreva.93.043854

Applying large magnetic fields to gain access to the hyperfine Paschen-Back regime can isolate three-level systems in a hot alkali metal vapors, thereby simplifying usually complex atom-light interactions. We use this method to make the first direct... Read More about Direct measurement of excited-state dipole matrix elements using electromagnetically induced transparency in the hyperfine Paschen-Back regime.

A versatile dual-species Zeeman slower for caesium and ytterbium (2016)
Journal Article
Hopkins, S., Butler, K., Guttridge, A., Kemp, S., Cornish, S., Freytag, R., …Tarbutt, M. (2016). A versatile dual-species Zeeman slower for caesium and ytterbium. Review of Scientific Instruments, 87(4), Article 043109. https://doi.org/10.1063/1.4945795

We describe the design, construction, and operation of a versatile dual-species Zeeman slower for both Cs and Yb, which is easily adaptable for use with other alkali metals and alkaline earths. With the aid of analytic models and numerical simulation... Read More about A versatile dual-species Zeeman slower for caesium and ytterbium.