Enhancement of phase sensitivity by the additional resource in a Mach-Zehnder interferometer

被引：3

作者：

Luo, Mengmeng ^{[1
]}

Chen, Yuetao ^{[1
]}

Liu, Jun ^{[2
]}

Ru, Shihao ^{[1
]}

Gao, Shaoyan ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Shaanxi Prov Key Lab Quantum Informat & Quantum O, MOE Key Lab Nonequilibrium Synth & Modulat Conden, Sch Phys, Xian 710049, Peoples R China

[2] Jiangsu Univ Sci & Technol, Sch Sci, Zhenjiang 212003, Jiangsu, Peoples R China

来源：

PHYSICS LETTERS A | 2022年 / 424卷

基金：

中国国家自然科学基金;

关键词：

Phase sensitivity; The parallel Mach-Zehnder interferometers; Difference-intensity detection; Two-phase estimation;

D O I：

10.1016/j.physleta.2021.127823

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Improving the phase sensitivity of the optical interferometer plays a key role in quantum metrology. We propose a novel scheme that two Mach-Zehnder interferometers (MZIs) are parallelly placed for investigating the single-phase and two-phase sensitivities. For single-phase estimation, we study the performance of phase sensitivity by difference-intensity detection. The results show that the external loss in the additional resource plays the role of enhancing the phase sensitivity. And the sub shot-noise phase sensitivity is obtained by adjusting the photon loss of the additional resource in the MZI even with the inputs of a vacuum state plus a coherent state. For two-phase estimation, we investigate the ultimate bounds of estimation precision and compare them with the case of single-phase estimation under optimized detection method. Our results could yield potential applications to quantum sensor, quantum imaging and quantum tomography. (C) 2021 Elsevier B.V. All rights reserved.

引用

页数：8