Nearly optimal measurement schemes in a noisy Mach-Zehnder interferometer with coherent and squeezed vacuum
Nearly optimal measurement schemes in a noisy Mach-Zehnder interferometer with coherent and squeezed vacuum
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DOI：
10.1140/epjqt/s40507-017-0058-8
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发表时间：
2017-04-07
影响因子：
5.3
通讯作者：
Dowling, Jonathan P.
中科院分区：
文献类型：
--
作者：
Gard, Bryan T.;You, Chenglong;Dowling, Jonathan P.
使用干涉仪在噪音条件下进行超精确的参数估计是一项具有挑战性的任务。在这里，我们讨论了一个众所周知的，敏感的输入状态，压缩真空和相干光的近最佳测量方案。我们发现，一个单一的模式强度测量，而最简单的，能够击败散粒噪声限制，是优于其他测量方案在低功率政权。然而，在高功率下，强度测量仅优于小的因子。具体来说，我们确认，无损条件下的最佳测量选择是奇偶测量。此外，我们还讨论了其他几种常见的测量方案的性能时，考虑光子损失，探测器效率，相位漂移，和热光子噪声。我们的结论是，与噪声的考虑，零差仍然接近最佳的低功率和高功率制度。令人惊讶的是，一些剩余的调查测量方案，包括以前的最佳奇偶校验测量，不保持甚至接近最佳时，引入噪声。
The use of an interferometer to perform an ultra-precise parameter estimation under noisy conditions is a challenging task. Here we discuss nearly optimal measurement schemes for a well known, sensitive input state, squeezed vacuum and coherent light. We find that a single mode intensity measurement, while the simplest and able to beat the shot-noise limit, is outperformed by other measurement schemes in the low-power regime. However, at high powers, intensity measurement is only outperformed by a small factor. Specifically, we confirm, that an optimal measurement choice under lossless conditions is the parity measurement. In addition, we also discuss the performance of several other common measurement schemes when considering photon loss, detector efficiency, phase drift, and thermal photon noise. We conclude that, with noise considerations, homodyne remains near optimal in both the low and high power regimes. Surprisingly, some of the remaining investigated measurement schemes, including the previous optimal parity measurement, do not remain even near optimal when noise is introduced.