Kramers-Kronig接收机的量子噪声
Quantum Noise of Kramers-Kronig Receiver
AI总结：
本文从解析上证明Kramers-Kronig接收机可利用最小相位信号各时刻径向测量信息间接恢复切向分量，将切向涨落降至径向的1/3，信噪比达到平衡外差检测的3/2倍，为降低量子涨落提供了可行方案。
摘要：
Kramers-Kronig（KK）接收机提供了一种在给定最小相位信号的条件下，通过强度检测重建复值光场的高效方法。本文从解析上证明：在通过测量最小相位信号来检测相干态的过程中，KK接收机在保持径向量子涨落与平衡外差检测相同的同时，能够通过采用KK关系，利用符号周期内其他时刻物理测得的径向分量信息，在判决时刻间接恢复切向分量，并使该切向分量的涨落等效降低至径向涨落的1/3。因此，KK接收机获得的信噪比达到平衡外差检测的3/2倍，同时呈现出依赖于时变相位的非对称量子涨落分布。由此，KK接收机提供了一种可行的方案，可将获取选定分量时的量子涨落降低至物理测量同一相干态分量时的2/3。本工作为KK接收机提供了物理层面的认识，并有望丰富量子光学测量中电磁噪声的相关知识。
英文摘要：
The Kramers-Kronig (KK) receiver provides an efficient method to reconstruct the complex-valued optical field by means of intensity detection given a minimum-phase signal. In this paper, we analytically show that for detecting coherent states through measuring the minimum-phase signal, while keeping the radial quantum fluctuation the same as the balanced heterodyne detection does, the KK receiver can indirectly recover the tangential component with fluctuation equivalently reduced to 1/3 times the radial one at the decision time, by adopting the KK relations to utilize the information of the physically measured radial component of other time of the symbol period. In consequence, the KK receiver achieves 3/2 times the signal-to-noise ratio of balanced heterodyne detection, while presenting an asymmetric quantum fluctuation distribution depending on the time-varying phase. Therefore, the KK receiver provides a feasible scheme to reduce the quantum fluctuation for obtaining the selected component to 2/ 3 times that of physically measuring the same component of the coherent state. This work provides a physical insight of the KK receiver and should enrich the knowledge of electromagnetic noise in quantum optical measurement.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
