论文标题
kramers-kronig接收器的量子噪声
Quantum Noise of Kramers-Kronig Receiver
论文作者
论文摘要
Kramers-kronig（KK）接收器提供了一种有效的方法，可以通过强度检测来重建复杂值的光场，并在给定最小相信号的情况下。 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符号时期。因此，KK接收器达到了平衡杂项检测的信号对噪声比的3/2倍，同时根据时间变化阶段表示不对称的量子波动分布。因此，KK接收器提供了一个可行的方案，以减少将所选成分的量子波动减少到相似状态的相同成分的2/3倍的量子波动。这项工作提供了KK接收器的物理见解，并应丰富量子光学测量中电磁噪声的知识。
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.
