Observation of a large, resonant, cross-Kerr nonlinearity in a free-space Rydberg mediumarXiv
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.
This work was supported (in part) by the Fetzer Franklin Fund of the John E. Fetzer Memorial Trust.