Unambiguous discrimination among quantum operations

被引：89
|
作者：
Wang, GM [1 ]
Ying, MS [1 ]
机构：
[1] Tsinghua Univ, State Key Lab Intelligent Technol & Syst, Dept Comp Sci & Technol, Beijing 100084, Peoples R China
来源：
PHYSICAL REVIEW A | 2006年 / 73卷 / 04期
关键词：
D O I：
10.1103/PhysRevA.73.042301
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We address the problem of unambiguous discrimination among a given set of quantum operations. The necessary and sufficient condition for them to be unambiguously distinguishable is derived in the cases of single use and multiple uses, respectively. For the latter case we explicitly construct the input states and corresponding measurements that accomplish the task. It is also found that the introduction of entanglement can improve the discrimination.
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页数：5
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