Towards polariton blockade of confined exciton–polaritons
Résumé
Cavity-polaritons in semiconductor microstructures have emerged as a promising system for exploring nonequilibrium dynamics of many-body systems [1]. Key advances in this field, including the observation of polariton condensation [2], superflu-idity [3], realization of topological photonic bands [4], and dissipative phase transitions [5-7], generically allow for a description based on a mean-field Gross-Pitaevskii formalism. While observation of polariton intensity squeezing [8, 30] and decoherence of a polarization entangled photon pair by a polariton condensate [10] provide counterexamples , quantum effects in these experiments show up at high polariton occupancy. Going beyond into the regime of strongly correlated polaritons requires the observation of a photon blockade effect [11, 12] where interactions are strong enough to suppress double occupancy of a photonic lattice site. Here, we report evidence of quantum correlations between polaritons spatially confined in a fibre cavity. Pho-ton correlation measurements show that careful tuning of the coupled system can lead to a modest reduction of simultaneous two-polariton generation probability by 5 %. Concurrently, our experiments allow us to measure the polariton interaction strength, thereby resolving the controversy stemming from recent experimental reports [13]. Our findings constitute an essential step towards the realization of strongly interacting photonic systems.
Origine : Fichiers produits par l'(les) auteur(s)
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