Phase estimation of phase shifts in two arms for an SU(1,1)interferometer with coherent and squeezed vacuum states  

作　　者：龚乾坤 李栋 袁春华 区泽宇 张卫平 

机构地区：[1]Quantum Institute for Light and Atoms,School of Physics and Material Science,East China Normal University [2]Collaborative Innovation Center of Extreme Optics,Shanxi University [3]Department of Physics,Indiana University–Purdue University Indianapolis [4]Department of Physics and Astronomy,Shanghai Jiao Tong University

出　　处：《Chinese Physics B》2017年第9期209-213,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11474095,11654005,and 11234003);the National Key Research and Development Program of China(Grant No.2016YFA0302000)

摘　　要：We theoretically study the quantum Fisher information（QFI） of the SU（1,1） interferometer with phase shifts in two arms by coherent squeezed vacuum state input, and give the comparison with the result of phase shift only in one arm.Different from the traditional Mach–Zehnder interferometer, the QFI of single-arm case for an SU（1,1） interferometer can be slightly higher or lower than that of two-arm case, which depends on the intensities of the two arms of the interferometer.For coherent squeezed vacuum state input with a fixed mean photon number, the optimal sensitivity is achieved with a squeezed vacuum input in one mode and the vacuum input in the other.We theoretically study the quantum Fisher information（QFI） of the SU（1,1） interferometer with phase shifts in two arms by coherent squeezed vacuum state input, and give the comparison with the result of phase shift only in one arm.Different from the traditional Mach–Zehnder interferometer, the QFI of single-arm case for an SU（1,1） interferometer can be slightly higher or lower than that of two-arm case, which depends on the intensities of the two arms of the interferometer.For coherent squeezed vacuum state input with a fixed mean photon number, the optimal sensitivity is achieved with a squeezed vacuum input in one mode and the vacuum input in the other.

关 键 词：phase estimation quantum Fisher information SU（1 1） interferometer 

分 类 号：TH744.3[机械工程—光学工程]