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Observation of a large, resonant, cross-Kerr nonlinearity in a free-space Rydberg medium

Sinclair, J.Angulo, D.Lupu-Gladstein, N.Bonsma-Fisher, K.Steinberg, A.M. Department of Physics,
Centre for Quantum Information and Quantum Control,
University of Toronto, Ontario, Canada

National Research Council of Canada,
Ottawa, Ontario, Canada

Canadian Institute For Advanced Research,
Toronto, Ontario, Canada
2019 Physics

We report the experimental observation of a cross-Kerr nonlinearity in a free-space medium based on resonantly-excited, interacting Rydberg atoms and electromagnetically induced transparency. The nonlinearity is used to implement cross-phase modulation between two optical pulses. The nonlinear phase written onto the (3) −822 probe pulse is measured to be as large as 8 mrad per nW of signal power, corresponding to a χ of 10 m /V . Potential applications range from optical quantum information processing to quantum non-demolition measure- ment of photon number.

The article was published in: arXiv preprint arXiv:1906.05151.

Full article

This work was supported (in part) by the Fetzer Franklin Fund of the John E. Fetzer Memorial Trust.