The Phase Sensitivities for Different Phase-Shift Configurations in an SU(1,1) Interferometer

被引：0

作者：

王凡 ^{[1
]}

钟伟 ^{[1
,2
]}

周澜 ^{[3
]}

盛宇波 ^{[1
,4
]}

机构：

[1] Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications

[2] National Laboratory of Solid State Microstructures, Nanjing University

[3] School of Science, Nanjing University of Posts and Telecommunications

[4] Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education

来源：

Communications in Theoretical Physics | 2019年 / 71卷 / 12期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

SU(1,1) interferometer; quantum Fisher information; one-and two-arm phase shifts; Homodyne measurement;

D O I：

暂无

中图分类号：

O413 [量子论]; TH744.3 [];

学科分类号：

070201 ; 0803 ;

摘要：

We theoretically study the phase sensitivities of two different phase-shift configurations in an SU(1,1)interferometer with coherent ■ squeezed vacuum states.According to quantum Cramér-Rao theorem,we analytically obtain the ultimate phase sensitivities for two types of phase shift accumulating in one-and two-arm.Compared with the case of one-arm phase shift,the model with phase shift encoding in both arms may provide a better sensitivity when the strength of squeezed vacuum state is large enough.Furthermore,we discuss the achievable sensitivities with the homodyne measurement by invoking of error-propagation formula.In addition,we study the effect of internal and outernal photon losses on the phase sensitivity of the SU(1,1) interferometer and find that the unbalanced interferometer is helpful to improve precision even with high external losses.

引用

页码：1435 / 1442

页数：8

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