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ElecSus: Extension to arbitrary geometry magneto-optics (2017)
Journal Article
Keaveney, J., Adams, C. S., & Hughes, I. G. (2017). ElecSus: Extension to arbitrary geometry magneto-optics. Computer Physics Communications, 224, 311-324. https://doi.org/10.1016/j.cpc.2017.12.001

We present a major update to ElecSus, a computer program and underlying model to calculate the electric susceptibility of an alkali-metal atomic vapour. Knowledge of the electric susceptibility of a medium is essential to predict its absorptive and d... Read More about ElecSus: Extension to arbitrary geometry magneto-optics.

Quantitative simulation of a magneto-optical trap operating near the photon recoil limit (2017)
Journal Article
Hanley, R. K., Huillery, P., Keegan, N. C., Bounds, A. D., Faoro, R., & Jones, M. P. (2018). Quantitative simulation of a magneto-optical trap operating near the photon recoil limit. Journal of Modern Optics, 65(5-6), 667-676. https://doi.org/10.1080/09500340.2017.1401679

We present a quantitative model for magneto-optical traps operating on narrow transitions, where the transition linewidth and the recoil shift are comparable. We combine a quantum treatment of the light scattering process with a Monte-Carlo simulatio... Read More about Quantitative simulation of a magneto-optical trap operating near the photon recoil limit.

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.

Lasing by driven atoms-cavity system in collective strong coupling regime (2017)
Journal Article
Sawant, R., & Rangwala, S. (2017). Lasing by driven atoms-cavity system in collective strong coupling regime. Scientific Reports, 7(1), Article 11432. https://doi.org/10.1038/s41598-017-11799-5

The interaction of laser cooled atoms with resonant light is determined by the natural linewidth of the excited state. An optical cavity is another optically resonant system where the loss from the cavity determines the resonant optical response of t... Read More about Lasing by driven atoms-cavity system in collective strong coupling regime.

Rydberg electrometry for optical lattice clocks (2017)
Journal Article
Bowden, W., Hobson, R., Huillery, P., Gill, P., Jones, M., & Hill, I. (2017). Rydberg electrometry for optical lattice clocks. Physical Review A, 96(2), Article 023419. https://doi.org/10.1103/physreva.96.023419

Electrometry is performed using Rydberg states to evaluate the quadratic Stark shift of the 5s2 1 S0-5s5p 3 P0 clock transition in strontium. By measuring the Stark shift of the highly excited 5s75d 1 D2 state using electromagnetically induced transp... Read More about Rydberg electrometry for optical lattice clocks.

ARC: An open-source library for calculating properties of alkali Rydberg atoms (2017)
Journal Article
Šibalić, N., Pritchard, J. D., Adams, C. S., & Weatherill, K. J. (2017). ARC: An open-source library for calculating properties of alkali Rydberg atoms. Computer Physics Communications, 220, 319-331. https://doi.org/10.1016/j.cpc.2017.06.015

We present an object-oriented Python library for computation of properties of highly-excited Rydberg states of alkali atoms. These include single-body effects such as dipole matrix elements, excited-state lifetimes (radiative and black-body limited)... Read More about ARC: An open-source library for calculating properties of alkali Rydberg atoms.

Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap (2017)
Journal Article
Guttridge, A., Hopkins, S. A., Kemp, S. L., Frye, M. D., Hutson, J. M., & Cornish, S. L. (2017). Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap. Physical Review A, 96(1), Article 012704. https://doi.org/10.1103/physreva.96.012704

We present measurements of interspecies thermalization between ultracold samples of 133Cs and either 174Yb or 170Yb. The two species are trapped in a far-off-resonance optical dipole trap and 133Cs is sympathetically cooled by Yb. We extract effectiv... Read More about Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap.

AC Stark Effect in Ultracold Polar 87Rb133Cs Molecules (2017)
Journal Article
Gregory, P. D., Blackmore, J. A., Aldegunde, J., Hutson, J. M., & Cornish, S. L. (2017). AC Stark Effect in Ultracold Polar 87Rb133Cs Molecules. Physical Review A, 96(2), Article 021402(R). https://doi.org/10.1103/physreva.96.021402

We investigate the effect of far-off-resonant trapping light on ultracold bosonic 87Rb133Cs molecules. We use kHz-precision microwave spectroscopy to measure the differential AC~Stark shifts between the ground and first excited rotational levels of t... Read More about AC Stark Effect in Ultracold Polar 87Rb133Cs Molecules.

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.

Circuit design for multi-body interactions in superconducting quantum annealing systems with applications to a scalable architecture (2017)
Journal Article
Chancellor, N., Zohren, S., & Warburton, P. (2017). Circuit design for multi-body interactions in superconducting quantum annealing systems with applications to a scalable architecture. npj Quantum Information, 3(1), Article 21. https://doi.org/10.1038/s41534-017-0022-6

Quantum annealing provides a way of solving optimization problems by encoding them as Ising spin models which are implemented using physical qubits. The solution of the optimization problem then corresponds to the ground state of the system. Quantum... Read More about Circuit design for multi-body interactions in superconducting quantum annealing systems with applications to a scalable architecture.

Rotational energy transfer in collisions between CO and Ar at temperatures from 293 to 30 K (2017)
Journal Article
Mertens, L., Labiad, H., Denis-Alpizar, O., Fournier, M., Carty, D., Le Picard, S. D., …Sims, I. R. (2017). Rotational energy transfer in collisions between CO and Ar at temperatures from 293 to 30 K. Chemical Physics Letters, 683, 521-528. https://doi.org/10.1016/j.cplett.2017.05.052

Experimental measurements and theoretical calculations are reported for rotational energy transfer in the Ar-CO system. Experiments were performed in cold uniform supersonic flows of Ar, using an infrared – vacuum ultraviolet double resonance techniq... Read More about Rotational energy transfer in collisions between CO and Ar at temperatures from 293 to 30 K.

Velocity selection in a Doppler-broadened ensemble of atoms interacting with a monochromatic laser beam (2017)
Journal Article
Hughes, I. G. (2018). Velocity selection in a Doppler-broadened ensemble of atoms interacting with a monochromatic laser beam. Journal of Modern Optics, 65(5-6), 640-647. https://doi.org/10.1080/09500340.2017.1328749

There is extensive use of monochromatic lasers to select atoms with a narrow range of velocities in many atomic physics experiments. For the commonplace situation of the inhomogeneous Doppler-broadened (Gaussian) linewidth exceeding the homogeneous (... Read More about Velocity selection in a Doppler-broadened ensemble of atoms interacting with a monochromatic laser beam.

Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection (2017)
Journal Article
Hanley, R. K., Bounds, A. D., Huillery, P., Keegan, N. C., Faoro, R., Bridge, E. M., …Jones, M. P. (2017). Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection. Journal of Physics B: Atomic, Molecular and Optical Physics, 50(11), Article 115002. https://doi.org/10.1088/1361-6455/aa6e79

We demonstrate a method for probing interaction effects in a thermal beam of strontium atoms using simultaneous measurements of Rydberg EIT and spontaneously created ions or electrons. We present a Doppler-averaged optical Bloch equation model that r... Read More about Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection.

A visual understanding of optical rotation using corn syrup (2017)
Journal Article
Nixon, M., & Hughes, I. (2017). A visual understanding of optical rotation using corn syrup. European Journal of Physics, 38(4), Article 045302. https://doi.org/10.1088/1361-6404/aa6a0b

In this paper a visual demonstration of optical rotation is presented, with content appropriate for use in a lecture demonstration as well as quantitative techniques suitable for an undergraduate-laboratory experiment. Linearly polarised lasers of va... Read More about A visual understanding of optical rotation using corn syrup.

Selective reflection from an Rb layer with a thickness below λ/12 and applications (2017)
Journal Article
Sargsyan, A., Papoyan, A., Hughes, I. G., Adams, C. S., & Sarkisyan, D. (2017). Selective reflection from an Rb layer with a thickness below λ/12 and applications. Optics Letters, 42(8), 1476-1479. https://doi.org/10.1364/ol.42.001476

We have studied the peculiarities of selective reflection from an Rb vapor cell with a thickness L < 70 nm, which is smaller than the length scale of evanescent fields λ∕2π and more than an order of magnitude smaller than the optical wavelength. A 24... Read More about Selective reflection from an Rb layer with a thickness below λ/12 and applications.

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.

Magnetic trapping of SH radicals (2017)
Journal Article
Eardley, J., Warner, N., Deng, L., Carty, D., & Wrede, E. (2017). Magnetic trapping of SH radicals. Physical Chemistry Chemical Physics, 19(12), 8423-8427. https://doi.org/10.1039/c7cp00458c

Magnetic trapping of SH radicals, produced via the photostop technique, has been demonstrated. H2S in a skimmed, supersonic molecular beam was photodissociated at 212.8 nm to produce SH inside a 330 mK deep static magnetic trap. The molecular-beam sp... Read More about Magnetic trapping of SH radicals.

Resonant transfer of large momenta from finite-duration pulse sequences (2017)
Journal Article
Fekete, J., Chai, S., Gardiner, S., & Andersen, M. (2017). Resonant transfer of large momenta from finite-duration pulse sequences. Physical Review A, 95(3), Article 033601. https://doi.org/10.1103/physreva.95.033601

We experimentally investigate the atom optics kicked particle at quantum resonance using finite duration kicks. Even though the underlying process is quantum interference, it can be well described by an ε -pseudoclassical model. The ε -pseudoclassica... Read More about Resonant transfer of large momenta from finite-duration pulse sequences.