A tight Cramer-Rao bound for joint parameter estimation with a pure two-mode squeezed probe

被引：23

作者：

Bradshaw, Mark ^{[1
]}

Assad, Syed M. ^{[1
]}

Lam, Ping Koy ^{[1
]}

机构：

[1] Australian Natl Univ, Res Sch Phys & Engn, Dept Quantum Sci, Ctr Quantum Computat & Commun Technol, Canberra, ACT 2601, Australia

来源：

PHYSICS LETTERS A | 2017年 / 381卷 / 32期

基金：

澳大利亚研究理事会;

关键词：

Quantum physics; Quantum information; Quantum optics; Parameter estimation; Cramer-Rao bound; QUANTUM ESTIMATION;

D O I：

10.1016/j.physleta.2017.06.024

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the Holevo Cramer-Rao bound for estimation of the displacement experienced by one mode of an two-mode squeezed vacuum state with squeezing r and find that it is equal to 4 exp(-2r). This equals the sum of the mean squared error obtained from a dual homodyne measurement, indicating that the bound is tight and that the dual homodyne measurement is optimal. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：2598 / 2607

页数：10

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