Adaptive versus nonadaptive strategies for quantum channel discrimination

被引：81

作者：

Harrow, Aram W. ^{[1
]}

Hassidim, Avinatan ^{[2
]}

Leung, Debbie W. ^{[3
]}

Watrous, John ^{[3
]}

机构：

[1] Univ Bristol, Dept Math, Bristol BS8 1TW, Avon, England

[2] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

[3] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada

来源：

PHYSICAL REVIEW A | 2010年 / 81卷 / 03期

基金：

英国工程与自然科学研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

PARAMETER-ESTIMATION;

D O I：

10.1103/PhysRevA.81.032339

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We provide a simple example that illustrates the advantage of adaptive over nonadaptive strategies for quantum channel discrimination. In particular, we give a pair of entanglement-breaking channels that can be perfectly discriminated by means of an adaptive strategy that requires just two channel evaluations, but for which no nonadaptive strategy can give a perfect discrimination using any finite number of channel evaluations.

引用

页数：6

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