Quantum dense metrology by an SU(2)-in-SU(1,1) nested interferometer
Quantum dense metrology by an SU(2)-in-SU(1,1) nested interferometer
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DOI：
10.1063/5.0012304
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发表时间：
2020-02
影响因子：
4
通讯作者：
W. Du;J. F. Chen;Z. Ou;Weiping Zhang
中科院分区：
文献类型：
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作者：
W. Du;J. F. Chen;Z. Ou;Weiping Zhang
量子密集计量学（QDM）是利用量子纠缠对光场的相位调制和振幅调制等两个共轭量进行联合估计的一种技术，其精度可以同时超过标准量子极限。SU（1，1）干涉仪（SUI）可以实现具有探测丢失容限的QDM，但绝对灵敏度有限。在这里，我们提出了一个QDM计划与线性干涉仪（SU（2））嵌套在SU（1，1）干涉仪。通过使用简并SUI并控制SUI中相敏放大器的相位角，可以实现任意相位和幅度调制混合的测量精度的最佳量子增强。
With the help of quantum entanglement, quantum dense metrology (QDM) is a technique that can perform the joint estimates of two conjugate quantities such as phase and amplitude modulations of an optical field with an accuracy beating the standard quantum limit simultaneously. SU(1,1) interferometers (SUI) can realize QDM with detection loss tolerance but is limited in absolute sensitivity. Here we present a QDM scheme with a linear interferometer (SU(2)) nested inside an SU(1,1) interferometer. By using a degenerate SUI and controlling the phase angle of the phase-sensitive amplifers in SUI, we can achieve the optimum quantum enhancement in the measurement precision of arbitrary mixture of phase and amplitude modulation.