Photon Correlation Signals in Coupled-Cavity Polaritons Created by Entangled Light
Photon Correlation Signals in Coupled-Cavity Polaritons Created by Entangled Light
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DOI：
10.1021/acsphotonics.1c01755
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发表时间：
2022-02
期刊：
影响因子：
7
通讯作者：
B. Gu;S. Mukamel
中科院分区：
文献类型：
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作者：
B. Gu;S. Mukamel
本文从理论上研究了光子符合计数技术，用于测量由光波导连接的两个光腔之间的纠缠。利用窄带泵浦下自发参量下转换产生的纠缠光子对的双光子吸收，可以有选择地探测离域双激发极化激元态。从远腔发射的光子的二阶相关函数g（τ）的单位偏差揭示了腔间的相关性。频域中的符合计数信号揭示了单极化激元态之间以及单极化激元与三极化激元之间的跃迁频率。高频光谱特征来自腔-分子耦合中的反向旋转项，使它们成为腔量子电动力学中超强耦合机制的直接特征。
We study theoretically a photon-coincidence counting technique aimed at measuring the entanglement between two optical cavities connected by an optical waveguide. Delocalized doubly excited polariton states can be selectively probed by two-photon absorption of an entangled photon pair generated by spontaneous parametric down-conversion with a narrowband pump. Deviations from unity of the second-order correlation function g(τ) of photons emitted from remote cavities reveal intercavity correlations. The coincidence counting signal in the frequency domain reveals the transition frequencies between single-polariton states and between single polaritons and tripolaritons. High-frequency spectral features arise from the counter-rotating terms in the cavity−molecule coupling, rendering them a direct signature for the ultrastrong coupling regime in cavity quantum electrodynamics.