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From classical to quantum loss of light coherence
preprintposted on 2023-01-10, 02:56 authored by Pierre Lassègues, Mateus Antônio Fernandes Biscassi, Martial Morisse, André Cidrim, Pablo Gabriel Santos Dias, Hodei Eneriz, Raul Celistrino Teixeira, Robin Kaiser, Romain Bachelard, Mathilde Hugbart
Light is a precious tool to probe matter, as it captures microscopic and macroscopic information on the system. We here report on the transition from a thermal (classical) to a spontaneous emission (quantum) mechanism for the loss of light coherence from a macroscopic atomic cloud. The coherence is probed by intensity-intensity correlation measurements realized on the light scattered by the atomic sample, and the transition is explored by tuning the balance between thermal coherence loss and spontaneous emission via the pump strength. Our results illustrate the potential of cold atom setups to investigate the classical-to-quantum transition in macroscopic systems.