Towards polariton blockade of confined exciton-polaritons
Towards polariton blockade of confined exciton-polaritons
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DOI：
10.1038/s41563-019-0282-y
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发表时间：
2019-03-01
期刊：
影响因子：
41.2
通讯作者：
Imamoglu, Atac
中科院分区：
文献类型：
--
作者：
Deiteil, Aymeric;Fink, Thomas;Imamoglu, Atac
半导体微结构中的腔极化子是研究多体系统非平衡动力学的一种很有前途的系统(1)。这一领域的主要进展，包括观察到的偏振子凝聚(2)、超流(3)、拓扑光子带的实现(4)和耗散相变(5-7)，通常允许基于平均场Gross-Pitaevskii形式的描述。另一方面，通过观察偏振子凝聚体(10)对偏振纠缠光子对的偏振子强度压缩(8，9)和退相干性，证明了在高极化子占有率下表现出的量子效应。要超越和进入强关联极化子的区域，需要观察到光子阻塞效应(11，12)，其中相互作用强到足以抑制光子晶格位置的双重占据。在这里，我们报告了空间限制在光纤腔中的极化子之间的量子关联的证据。光子相关测量表明，仔细调整耦合系统可以使同时产生双极化子的几率适度降低5%。同时，我们的实验使我们能够测量极化子相互作用强度，从而解决了最近的实验报告引起的争议(13)。我们的发现是朝着实现强相互作用光子系统迈出的重要一步。
Cavity-polaritons in semiconductor microstructures have emerged as a promising system for exploring non-equilibrium dynamics of many-body systems(1). Key advances in this field, including the observation of polariton condensation(2), superfluidity(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. Observation of polariton intensity squeezing(8,9) and decoherence of a polarization entangled photon pair by a polariton condensate(10), on the other hand, demonstrate quantum effects that show up at high polariton occupancy. Going beyond and 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. Photon 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.