Nonclassicality phase-space functions: more insight with fewer detectors.
Nonclassicality phase-space functions: more insight with fewer detectors.
复制标题
非经典相空间函数：用更少的探测器获得更多洞察。
DOI：
10.1103/physrevlett.114.103602
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发表时间：
2014
影响因子：
8.6
通讯作者：
W. Vogel
中科院分区：
文献类型：
--
作者：
A. Luis;J. Sperling;W. Vogel
开-关探测器的系统被很好地建立用于测量小光子数范围内的辐射场。我们建议联合收割机这些检测器系统与不平衡零差与弱本地振荡器。这种方法产生相空间函数，它代表了标准光电探测理论的s参数化准概率的点击对应物。这类引入的分布可以直接从测量的点击计数统计数据中采样。因此，我们的技术可视化非经典效应，而无需进一步的数据处理。令人惊讶的是，少量的开关二极管可以产生比完美的光子数分辨率更多的洞察力。量子化辐射场的粒子域和波域中的量子特征（分别由光子数和压缩态所示）将根据采样相空间函数的负性来揭示。该方法的有效性将有助于量子光学和量子技术等领域的应用。
Systems of on-off detectors are well established for measuring radiation fields in the regime of small photon numbers. We propose to combine these detector systems with unbalanced homodyning with a weak local oscillator. This approach yields phase-space functions, which represent the click counterpart of the s parametrized quasiprobabilities of standard photoelectric detection theory. This introduced class of distributions can be directly sampled from the measured click-counting statistics. Therefore, our technique visualizes nonclassical effects without further data processing. Surprisingly, a small number of on-off diodes can yield more insight than perfect photon number resolution. Quantum signatures in the particle and wave domain of the quantized radiation field, as shown by photon number and squeezed states, respectively, will be uncovered in terms of negativities of the sampled phase-space functions. Application in the vast fields of quantum optics and quantum technology will benefit from our efficient nonclassicality characterization approach.