Phase estimation of a Mach-Zehnder interferometer via the Laguerre excitation squeezed state

Author:

Zhao Zekun,Zhang Huan1,Huang Yibing,Hu Liyun

Affiliation:

1. Sun Yat-sen University

Abstract

Quantum metrology has an important role in the fields of quantum optics and quantum information processing. Here we introduce a kind of non-Gaussian state, Laguerre excitation squeezed state as inputs of traditional Mach-Zehnder interferometer to examine phase estimation in realistic case. We consider the effects of both internal and external losses on phase estimation by using quantum Fisher information and parity detection. It is shown that the external loss presents a bigger effect than the internal one. The phase sensitivity and the quantum Fisher information can be improved by increasing the photon number and even surpass the ideal phase sensitivity by two-mode squeezed vacuum in a certain region of phase shift for realistic case. Our results can find significant practical applications in quantum metrology.

Funder

National Natural Science Foundation of China

The Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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