Quantum Fisher information of entangled coherent states in the presence of photon loss

被引：182

作者：

Zhang, Y. M. ^{[1
]}

Li, X. W. ^{[1
]}

Yang, W. ^{[2
]}

Jin, G. R. ^{[1
]}

机构：

[1] Beijing Jiaotong Univ, Dept Phys, Beijing 100044, Peoples R China

[2] Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China

来源：

PHYSICAL REVIEW A | 2013年 / 88卷 / 04期

关键词：

INTERFEROMETRY; METROLOGY; NOISE; LIMIT;

D O I：

10.1103/PhysRevA.88.043832

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We investigate the performance of entangled coherent states for quantum-enhanced phase estimation. An exact analytical expression of quantum Fisher information is derived to show the role of photon losses on the ultimate phase sensitivity. We find a transition of the sensitivity from the Heisenberg scaling to the classical scaling due to quantum decoherence of the photon state. This quantum-classical transition is uniquely determined by the number of photons being lost, instead of the number of incident photons or the photon loss rate alone. Our results also reveal that a crossover of the sensitivity between the entangled coherent state and the NOON state can occur even for very small photon loss rate.

引用

页数：7

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