Photon statistics of organic polariton condensates

We report on the quantum statistical properties of organic polariton condensates. Our experimental study demonstrates low particle number fluctuations for highly populated condensates at room temperature. We show a quantum noise of the condensate that is ∼100 times the shot-noise limit of an ideal coherent light source, setting the lower limit of the noise for organic polariton devices. Despite the high thermal fluctuations at room temperature, strong dynamical instability, and static disorder intrinsic to organic systems, the condensate exhibits an extremely high degree of second-order coherence g(2)(τ=0) down to 1.00034±1×10-5. We elucidate a nontrivial behavior in the second-order coherence of the condensate with its spatial extension. Unlike a conventional laser, the organic polariton condensate tends to increase its noise level above shot-noise fluctuations due to a complex interplay between polariton thermalization, cavity lifetime, and kinetic losses originating from the quantum fluid properties of polariton condensates.