Memory Effects in Quantum Channel Discrimination

被引：131

作者：

Chiribella, Giulio ^{[1
]}

D'Ariano, Giacomo M. ^{[1
,2
]}

Perinotti, Paolo ^{[1
]}

机构：

[1] Univ Pavia, Dipartimento Fis A Volta, QUIT Quantum Informat Theory Grp, I-27100 Pavia, Italy

[2] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.101.180501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider quantum-memory assisted protocols for discriminating quantum channels. We show that for optimal discrimination of memory channels, memory assisted protocols are needed. This leads to a new notion of distance for channels with memory, based on the general theory of quantum testers. For discrimination and estimation of sets of independent unitary channels, we prove optimality of parallel protocols among all possible architectures.

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页数：4

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