Correlation functions with single-photon emitters under noisy resonant continuous excitation
Correlation functions with single-photon emitters under noisy resonant continuous excitation
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DOI：
10.1103/physreva.99.013842
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发表时间：
2019-01-22
影响因子：
2.9
通讯作者：
Diederichs, C.
中科院分区：
文献类型：
--
作者：
Baudin, E.;Proux, R.;Diederichs, C.
为了表征源的统计特性和不可测性，通常使用各种干涉仪测量发射场的相关函数。在这里，我们提出了一个理论框架的计算的相关函数的两个能级系统，是由一个现实的嘈杂的连续波激发激光共振驱动。一阶和二阶自相关函数的解析表达式得到的噪声激励源的各种贡献被正确地考虑在内。我们预测，即使在低功率区，噪声源对两能级系统动力学有很强的影响，这是更简单的模型所没有预料到的。在脉冲激发下，光子不可逆性的表征通常是通过测量用Hong-Ou-Mandel干涉仪获得的零延迟强度相关值来完成的。我们表明，这个数字是不相关的连续波激发制度，我们引入合并的时间窗口，一个数字的优点的基础上的概率解释的概念光子不可分割性。最后，我们使用合并时间窗来量化噪声连续波激发如何影响光子不可逆性。
To characterize the statistics and indistinguishability of a source, it is common to measure the correlation functions of the emitted field using various interferometers. Here, we present a theoretical framework for the computation of the correlation functions of a two-level system that is resonantly driven by a realistic noisy cw excitation laser. Analytic expressions of the first- and second-order autocorrelation functions are obtained where the various contributions of the noisy excitation source are correctly taken into account. We predict that, even in the low power regime, the noise source has a strong influence on the two-level system dynamics, which is not anticipated by simpler models. The characterization of photon indistinguishability in the pulsed excitation regime is usually done by measuring the value of the zero-delay intensity correlation obtained with a Hong-Ou-Mandel interferometer. We show that this figure is irrelevant in the cw excitation regime and we introduce the coalescence time window, a figure of merit based on a probabilistic interpretation of the notion of photon indistinguishability. We finally use the coalescence time window to quantify how noisy cw excitation influences photon indistinguishability.