Entropic uncertainties for joint quantum measurements

被引：5

作者：

Brougham, Thomas ^{[1
,2
]}

Andersson, Erika ^{[3
]}

Barnett, Stephen M. ^{[2
]}

机构：

[1] Czech Tech Univ, FJFI, Dept Phys, Prague 11519 1, Czech Republic

[2] Univ Strathclyde, SUPA, Dept Phys, Glasgow G4 ONG, Lanark, Scotland

[3] Heriot Watt Univ, SUPA, Dept Phys, Sch EPS, Edinburgh EH14 4AS, Midlothian, Scotland

来源：

PHYSICAL REVIEW A | 2009年 / 80卷 / 04期

关键词：

INFORMATION;

D O I：

10.1103/PhysRevA.80.042106

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We investigate the uncertainty associated with a joint quantum measurement of two spin components of a spin-1/2 particle and quantify this in terms of entropy. We consider two entropic quantities, the joint entropy and the sum of the marginal entropies, and obtain lower bounds for each of these quantities. For the case of joint measurements where we measure each spin observable equally well, these lower bounds are tight.

引用

页数：10

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