Optical phase estimation via the coherent state and displaced-photon counting
Optical phase estimation via the coherent state and displaced-photon counting
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DOI：
10.1103/physreva.94.033842
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发表时间：
2016-04
影响因子：
2.9
通讯作者：
S. Izumi;M. Takeoka;K. Wakui;M. Fujiwara;K. Ema;M. Sasaki
中科院分区：
文献类型：
--
作者：
S. Izumi;M. Takeoka;K. Wakui;M. Fujiwara;K. Ema;M. Sasaki
在量子极限精度下，我们考虑了弱光学相干态的位相传感问题。受相干光通信中量子次优测量的启发，提出了一种相位估计的检测方案。我们从理论上分析了基于Fisher信息的位相检测方案--位移光子计数的性能，结果表明，在较大的目标相位范围内，位移光子计数的性能优于静态零差和外差检测。利用线性光学和超导纳米线单光子探测器进行了原理验证实验。结果表明，即使在实际存在缺陷的情况下，我们的方案也克服了理想零差测量的局限性。
We consider the phase sensing via a weak optical coherent state at quantum limit precision. A detection scheme for the phase estimation is proposed, which is inspired by the suboptimal quantum measurement in coherent optical communication. We theoretically analyze a performance of our detection scheme, which we call the displaced-photon counting, for phase sensing in terms of the Fisher information and show that the displaced-photon counting outperforms the static homodyne and heterodyne detections in a wide range of the target phase. The proof-of-principle experiment is performed with linear optics and a superconducting nanowire single-photon detector. The result shows that our scheme overcomes the limit of the ideal homodyne measurement, even under practical imperfections.