Effects of loss on the phase sensitivity with parity detection in an SU(1,1) interferometer
Effects of loss on the phase sensitivity with parity detection in an SU(1,1) interferometer
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SU(1,1) 干涉仪中奇偶校验检测损耗对相位灵敏度的影响
DOI：
10.1364/josab.35.001080
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Weiping Zhang
中科院分区：
文献类型：
--
作者：
Dong Li;Chun-Hua Yuan;Yao Yao;Wei Jiang;Mo Li;Weiping Zhang
从理论上研究了损耗对不同输入态奇偶检测SU(1，1)干涉仪相位灵敏度的影响。结果表明，虽然在有损耗的情况下，相位估计的灵敏度有所降低，但仍能以较小的损耗超过散粒噪声极限。为了检验奇偶检测的性能，在零差检测、强度检测和奇偶检测之间执行比较。与零差检测和强度检测相比，奇偶检测在没有损耗的情况下具有稍好的最佳相位灵敏度，但在单相干态或相干⊗压缩态输入时具有较差的最佳相位灵敏度和显著的损耗。
We theoretically study the effects of loss on the phase sensitivity of an SU(1,1) interferometer with parity detection with various input states. We show that although the sensitivity of phase estimation decreases in the presence of loss, it can still beat the shot-noise limit with small loss. To examine the performance of parity detection, the comparison is performed among homodyne detection, intensity detection, and parity detection. Compared with homodyne detection and intensity detection, parity detection has a slightly better optimal phase sensitivity in the absence of loss but has a worse optimal phase sensitivity with a significant amount of loss with one-coherent state or coherent ⊗ squeezed state input.