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Light is a precious tool to probe matter, as it captures microscopic andmacroscopic information on the system. We here report on the transition from athermal (classical) to a spontaneous emission (quantum) mechanism for the lossof light coherence from a macroscopic atomic cloud. The coherence is probed byintensity-intensity correlation measurements realized on the light scattered bythe atomic sample, and the transition is explored by tuning the balance betweenthermal coherence loss and spontaneous emission via the pump strength. Ourresults illustrate the potential of cold atom setups to investigate theclassical-to-quantum transition in macroscopic systems.

From classical to quantum loss of light coherence