Symmetry-protected collisions between strongly interacting photons

Jeff D. Thompson,Travis L. Nicholson,Qi-Yu Liang,Sergio H. Cantu,Aditya V. Venkatramani,Soonwon Choi,Ilya A. Fedorov,Daniel Viscor,Thomas Pohl,Mikhail D. Lukin,Vladan Vuletić

Nature（2017）

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摘要

Excitations to Rydberg states in a gas of ultracold atoms are used to produce a robust, nonlinear phase shift of exactly π/2 between two photons, which is protected against variations in experimental parameters by a symmetry of the system.

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