QUROPE Quantum Information Processing and Communication in Europe

Max F Riedel, Daniele Binosi, Rob Thew and Tommaso Calarco have recently authored an article tackling the Topic of the

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.

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.

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.

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.

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

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

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

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

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