Quantum metrology with two-mode squeezed thermal state: Parity detection and phase sensitivity

被引：10
|
作者：
Li, Heng-Mei [1 ]
Xu, Xue-Xiang [2 ]
Yuan, Hong-Chun [3 ,4 ]
Wang, Zhen [1 ]
机构：
[1] Changzhou Inst Technol, Coll Math Phys & Chem Engn, Changzhou 213002, Peoples R China
[2] Jiangxi Normal Univ, Coll Phys & Commun Elect, Nanchang 330022, Peoples R China
[3] Changzhou Inst Technol, Coll Elect & Optoelect Engn, Changzhou 213002, Peoples R China
[4] Changzhou Inst Modern Optoelect Technol, Changzhou 213002, Peoples R China
来源：
CHINESE PHYSICS B | 2016年 / 25卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Mach-Zenhder interferometer; two-mode squeezed thermal state; Wigner function; phase sensitivity; HEISENBERG LIMIT; FOCK;
D O I：
10.1088/1674-1056/25/10/104203
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Based on the Wigner-function method, we investigate the parity detection and phase sensitivity in a Mach-Zehnder interferometer (MZI) with two-mode squeezed thermal state (TMSTS). Using the classical transformation relation of the MZI, we derive the input-output Wigner functions and then obtain the explicit expressions of parity and phase sensitivity. The results from the numerical calculation show that supersensitivity can be reached only if the input TMSTS have a large number photons.
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页数：7
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