The second-order photon correlation function $g^{\left(2\right)}(\tau )$ is of great importance in quantum optics. $g^{\left(2\right)}(\tau )$ is typically measured with the Hanbury Brown and Twiss (HBT) interferometer, which employs a pair of single-photon detectors and a dual-channel time acquisition module. Here, we demonstrate a new method to measure and extract $g^{\left(2\right)}(\tau )$ with a standard single-photon avalanche photodiode (dead-time = 22 ns) and a single-channel time acquisition module. This is realized by shifting the coincidence counts of interest to a time window not affected by the dead-time and after-pulse of the detection system using a fiber-based delay line. The new scheme is verified by measuring $g^{\left(2\right)}(\tau )$ from a single colloidal nanocrystal. Photon antibunching is unambiguously observed and agrees well with the result measured using the standard HBT setup. Our scheme simplifies the higher-order correlation technique and might be favored in cost-sensitive circumstances.

中文翻译：

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仅使用一个标准单光子探测器观察光子反聚束

二阶光子相关函数 $G^{\left(2\right)}（\tau ）$ 在量子光学中非常重要。 $G^{\left(2\right)}（\tau ）$通常使用Hanbury Brown and Twiss（HBT）干涉仪进行测量，该干涉仪采用一对单光子检测器和一个双通道时间采集模块。在这里，我们演示了一种新的测量和提取方法$G^{\left(2\right)}（\tau ）$配有标准的单光子雪崩光电二极管（死区时间= 22 ns）和单通道时间获取模块。这是通过使用基于光纤的延迟线将感兴趣的重合计数移动到不受检测系统的死区时间和后脉冲影响的时间窗口来实现的。新方案通过测量验证$G^{\left(2\right)}（\tau ）$来自单个胶体纳米晶体。可以清楚地观察到光子反聚束，并且与使用标准HBT设置测得的结果非常吻合。我们的方案简化了高阶相关技术，并且在成本敏感的情况下可能会受到青睐。