弱相干光信号的相位无关测量
Phase Independent Measurement of Weak Coherent Optical Signals
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中文总结 AI 辅助
该研究提出基于SU(1,1)干涉仪的相位无关强度检测方案，可无需本地振荡器等设备实现弱相干光位移的相位独立测量，性能接近量子克拉美罗界，为实用相位无关量子传感提供平台。
中文摘要 AI 辅助
我们开发了一种基于SU(1,1)干涉仪的量子传感框架，用于弱相干光位移的相位无关检测。与需要先验信号相位知识及相干零差检测的传统量子测量协议不同，该方法可独立于相位估计位移幅度。我们证明，在理想无损条件下，仅采用总强度检测的传统SU(1,1)干涉仪，其位移幅度估计可达到量子克拉美罗界。我们进一步推导了该传统SU(1,1)干涉仪在总强度检测下的量子克拉美罗界与灵敏度的解析表达式，并系统研究了其在存在光损耗时的性能。所提出的相位无关强度检测方案在实验相关的工作区间内可达到相当的性能，同时无需本地振荡器、相位锁定及正交跟踪。这些结果确立了基于SU(1,1)的强度检测作为相位无关量子传感的实用平台。
英文摘要
We develop a quantum sensing framework for the phase independent detection of weak coherent optical displacements based on SU(1,1) interferometry. Unlike conventional quantum measurement protocols that require prior knowledge of the signal phase and coherent homodyne detection, the proposed approach estimates the displacement magnitude independently of its phase. We show that, under ideal lossless conditions, a conventional SU(1,1) interferometer employing only total intensity detection saturates the quantum Cramer Rao bound for displacement magnitude estimation. We further derive the analytical expression of the quantum Cramer Rao bound and the sensitivity of the conventional SU(1,1) interferometer with total intensity detection and systematically investigate its performance in the presence of optical loss. The proposed phase-independent intensity detection scheme achieves comparable performance over experimentally relevant operating regimes while eliminating the need for local oscillators, phase locking, and quadrature tracking. These results establish SU(1,1) based intensity detection as a practical platform for phase independent quantum sensing.
发表机构
- University of Tennessee, Chattanooga（田纳西大学查塔努加分校）
- FAMU–FSU College of Engineering, Florida State University（佛罗里达州立大学 FAMU-FSU 工程学院）
- Department of Biological and Agricultural Engineering, Texas A&M University（德克萨斯农工大学生物与农业工程系）
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