Quantum metrology: Dynamics versus entanglement

被引：190

作者：

Boixo, Sergio ^{[1
,2
]}

Datta, Animesh ^{[1
]}

Davis, Matthew J. ^{[3
]}

Flammia, Steven T. ^{[4
]}

Shaji, Anil ^{[1
]}

Caves, Carlton M. ^{[1
,3
]}

机构：

[1] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[3] Univ Queensland, Sch Phys Sci, Brisbane, Qld 4072, Australia

[4] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.101.040403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A parameter whose coupling to a quantum probe of n constituents includes all two-body interactions between the constituents can be measured with an uncertainty that scales as 1/n(3/2), even when the constituents are initially unentangled. We devise a protocol that achieves the 1/n(3/2) scaling without generating any entanglement among the constituents, and we suggest that the protocol might be implemented in a two-component Bose-Einstein condensate.

引用

页数：4

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