Photon number-resolved measurement of an exciton-polariton condensate
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We measure the full photon-number distribution emitted from a Bose condensate of microcavity exciton-polaritons confined in a micropillar cavity. The statistics are acquired by means of a photon number resolving transition edge sensor. We directly observe that the photon-number distribution evolves with the non-resonant optical excitation power from geometric to quasi-Poissonian statistics, which is canonical for a transition from a thermal to a coherent state. Moreover, the photon-number distribution allows evaluating the higher-order photon correlations, shedding further light on the coherence formation and phase transition of the polariton condensate. The experimental data is analyzed in terms of thermal coherent states which allows one to directly extract the thermal and coherent fraction from the measured distributions. These results pave the way for a full understanding of the contribution of interactions in light-matter condensates in the coherence buildup at threshold.
Klaas , M , Schlottmann , E , Flayac , H , Laussy , F P , Gericke , F , Schmidt , M , v. Helversen , M , Beyer , J , Brodbeck , S , Suchomel , H , Höfling , S , Reitzenstein , S & Schneider , C 2018 , ' Photon number-resolved measurement of an exciton-polariton condensate ' , Physical Review Letters , vol. 121 , no. 4 , 047401 . https://doi.org/10.1103/PhysRevLett.121.047401
Physical Review Letters
© 2018, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.121.047401
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