Quantum-correlated photons from semiconductor cavity polaritons
Quantum-correlated photons from semiconductor cavity polaritons
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来自半导体腔极化子的量子相关光子
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
J. Bloch
中科院分区：
文献类型：
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作者：
G. Muñoz‐Matutano;Andrew Wood;M. Johnson;Xavier;Vidal Asensio;B. Baragiola;A. Reinhard;T. Volz;A. Lemaître;J. Bloch
在过去的十年里，半导体微腔中的激子-极化激子作为一种驱动耗散量子流体引起了人们极大的兴趣[1]。这些系统为自己提供了一个通用的平台，用于执行光的哈密顿模拟[2-4]，以及实验实现非平凡的非平衡相变[5]。此外，极化子表现出相当大的相互作用强度，在量子态产生的背景下开辟了一系列可能性。虽然以前已经报道过极化子的压缩光发射[6]，但到目前为止还没有观察到极化子的颗粒性[7]。后一种能力对于在可扩展的耦合腔阵列上实现光的强关联多体量子态特别有吸引力[8]。在这里，我们证明了，通过光学地将极化子限制在非常小的有效模体积内，人们可以达到弱阻挡区域，在该区域，非线性变得足够强，在少数粒子水平上变得显著，从而在发射的光子统计中产生不可忽略的反聚束[9]。我们的结果为进入新出现的量子极化电子学领域打开了大门，并证明了光学受限激子-极化电子可以被认为是产生单光子的一种现实的新策略。
Over the past decade, exciton-polaritons in semiconductor microcavities have attracted a great deal of interest as a driven-dissipative quantum fluid [1]. These systems offer themselves as a versatile platform for performing Hamiltonian simulations with light [2–4], as well as for experimentally realizing nontrivial out-of-equilibrium phase transitions [5]. In addition, polaritons exhibit a sizeable mutual interaction strength that opens up a whole range of possibilities in the context of quantum state generation. While squeezed light emission from polaritons has been reported previously [6], the granular nature of polaritons has not been observed to date [7]. The latter capability is particularly attractive for realizing strongly correlated many-body quantum states of light on scalable arrays of coupled cavities [8]. Here we demonstrate that by optically confining polaritons to a very small effective mode volume, one can reach the weak blockade regime, in which the nonlinearity turns strong enough to become significant at the few particle level, and thus produce a non-negligible antibunching in the emitted photons statistics [9]. Our results act as a door opener for accessing the newly emerging field of quantum polaritonics, and as a proof of principle that optically confined exciton-polaritons can be considered as a realistic, new strategy to generate single photons.