Result

Contactless nonlinear optics mediated by long-range Rydberg interactions

Date: 
2016-12-19
Author(s): 

Hannes Busche, Paul Huillery, Simon W. Ball, Teodora Ilieva, Matthew P. A. Jones & Charles S. Adams

Reference: 

Nature Physics (2017), doi:10.1038/nphys4058

In conventional nonlinear optics, linear quantum optics

Single-photon interference due to motion in an atomic collective excitation

Date: 
2016-12-19
Author(s): 

Daniel J. Whiting, Nikola Šibalić, James Keaveney, Charles S. Adams, and Ifan G. Hughes

Reference: 

arXiv:1612.05467v1

Quantum-state engineering is of critical importance to the development of quantum technologies. One promising platform is thermal atomic vapours, because they offer long coherence times with reproducible and scalable hardware. However, the inability to address isolated atomic states in a controlled manner, due to multi-level degeneracy and motional broadening, is a major obstacle to their wider application.

ARC: An open-source library for calculating properties of alkali Rydberg atoms

Date: 
2016-12-16
Author(s): 

N. Šibalic, J. D. Pritchard, C. S. Adams, K. J. Weatherill

Reference: 

arXiv:1612.05529v1

We present an object-oriented Python library for computation of properties of highly-excited Rydberg states of alkali atoms.

Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions

Date: 
2016-07-14
Author(s): 

N. Sibalic, C. G. Wade, C. S. Adams, K. J. Weatherill and T. Pohl

Reference: 

PHYSICAL REVIEW A 94, 011401(R) (2016)

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 critically rely on the presence of a slower decaying potential core.

Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection

Date: 
2017-04-21
Author(s): 

Hanley, Ryan K and Bounds, Alistair D and Huillery, Paul and Keegan, Niamh C and Faoro, Riccardo and Bridge, Elizabeth M and Weatherill, Kevin J and Jones, Matthew P A

Reference: 

arXiv:1702.05039

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 reproduces the optical signals and allows us to connect the optical coherences and the populations.

Optical techniques for Rydberg physics in lattice geometries

Date: 
2017-05-02
Author(s): 

Julian B. Naber, Jannie Vos, Robert J. Rengelink, Rosanne J. Nusselder, and David Davtyan

Reference: 

Eur. Phys. J. Spec. Top. (2016) 225

We address the technical challenges when performing quantum information experiments with ultracold Rydberg atoms in lattice geometries. We discuss the following key aspects: (i) the coherent manipulation of atomic ground states, (ii) the coherent excitation of Rydberg states, and (iii) spatial addressing of individual lattice sites.

Rydberg dressing of a one-dimensional Bose-Einstein condensate

Date: 
2017-05-02
Author(s): 

Marcin Płodzień, Graham Lochead, Julius de Hond, N. J. van Druten, and Servaas Kokkelmans

Reference: 

Phys. Rev. A 95, 043606 (2017)

We study the influence of Rydberg-dressed interactions in a one-dimensional (1D) Bose-Einstein condensate (BEC). We show that a 1D geometry offers several advantages over a three-dimensional geometry for observing BEC Rydberg dressing. The effects of dressing are studied by investigating collective BEC dynamics after a rapid switch-off of the Rydberg dressing interaction.

A sensitive electrometer based on a Rydberg atom in a Schrödinger-cat state

Date: 
2016-07-14
Author(s): 

Adrien Facon, Eva-Katharina Dietsche, Dorian Grosso, Serge Haroche, Jean-Michel Raimond, Michel Brune & Sébastien Gleyzes

Reference: 

Nature 535, 262–265 (14 July 2016) doi:10.1038/nature18327

Fundamental quantum fluctuations caused by the Heisenberg principle limit measurement precision.

Rydberg-induced optical nonlinearities from a cold atomic ensemble trapped inside a cavity

Date: 
2016-04-05
Author(s): 

R. Boddeda, I. Usmani, E. Bimbard, A. Grankin, A. Ourjoumtse, E. Brion & P. Grangier

Reference: 

J. Phys. B: At. Mol. Opt. Phys. 49, 084005 (2016)

We experimentally characterize the optical nonlinear response of a cold atomic medium placed inside an optical cavity, and excited to Rydberg states. The excitation to S and D Rydberg levels is carried out via a two-photon transition in an electromagnetically induced transparency configuration, with a weak (red) probe beam on the lower transition, and a strong (blue) coupling beam on the upper transition. The observed optical nonlinearities induced by S states for the probe beam can be explained using a semi-classical model with van der Waals' interactions.

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