Quantum Engineering

The European quantum technologies flagship programme - Special Issue in Quantum Science and Technology

Summary: 

A recently published article on the Quantum Science and Technology tackles the topic of the European Quantum Technologies Flagship Programme

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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.

Inelastic Photon Scattering via the Intracavity Rydberg Blockade

Date: 
2016-12-16
Author(s): 

A. Grankin, E. Brion, R. Boddeda, S. Ćuk, I. Usmani, A. Ourjoumtsev & P. Grangier

Reference: 

Phys. Rev. Lett. 117, 253602 (2016)

Electromagnetically induced transparency (EIT) in a ladder system involving a Rydberg level is known to yield giant optical nonlinearities for the probe field, even in the few-photon regime. This enhancement is due to the strong dipole-dipole interactions between Rydberg atoms and the resulting excitation blockade phenomenon. In order to study such highly correlated media, ad hoc models or low-excitation assumptions are generally used to tackle their dynamical response to optical fields.

Nonlinear optical susceptibility of EIT systems with a degenerate Rydberg level

Date: 
2016-05-23
Author(s): 

Jovica Stanojevic, Philippe Grangier & Robin Côté

Reference: 

J. Phys. B: At. Mol. Opt. Phys. 49, 124003 (2016)

It has been demonstrated that very large optical nonlinearities can arise in cold Rydberg gases from strong Rydberg–Rydberg interactions. The interactions between atoms excited to a degenerate Rydberg level are described by a large number of molecular potentials which greatly complicates the theoretical treatment of these systems. We here present a method for very accurate calculation of the third order interaction-induced optical nonlinearities that fully includes the angle-dependent mixing of molecular states by the control optical field.

Quantum-optical nonlinearities induced by Rydberg-Rydberg interactions: A perturbative approach

Date: 
2015-10-29
Author(s): 

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

Reference: 

Phys. Rev. A 92, 043841 (2015)

In this article, we theoretically study the quantum statistical properties of the light transmitted through or reflected from an optical cavity, filled by an atomic medium with strong optical nonlinearity induced by Rydberg-Rydberg van der Waals interactions. Atoms are driven on a two-photon transition from their ground state to a Rydberg level via an intermediate state by the combination of a weak signal field and a strong control beam.

Quantum Technologies have a hearing at the US Congress

Summary: 

On the 16 March 2016, The U.S.-China Economic and Security Review Commission of the United States Congress held a hearing on China's pursuit of new technologies. one of the panel was focussed on Quantum Technologies.

On the 16 March 2016, The U.S.-China Economic and Security Review Commission of the United States Congress held a hearing on China's pursuit of new technologies.

https://www.uscc.gov/Hearings/hearing-china’s-pursuit-next-frontier-tech-computing-robotics-and-biotechnology-video

Spring meeting of the DPG, Mainz (Germany), 6–10 March 2017

Talk by Antoine Browaeys: "Implementation of spin hamiltonians in arrays of individual Rydberg atoms"

Workshop UQUAM, Berlin (Germany), 24–27 October 2016

Talk by Antoine Browaeys: "Implementation of spin hamiltonians in arrays of individual Rydberg atoms"

Workshop of the SFB FoQuS, Innsbruck (Austria), 6–7 October 2016

Talk by Thierry Lahaye: "Realizing spin Hamiltonians in tunable 2D arrays of single Rydberg atoms"

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