Comparison of two unknown pure quantum states

被引：79
作者：
Barnett, SM
Chefles, A [1 ]
Jex, I
机构：
[1] Univ Hertfordshire, Dept Phys Sci, Hatfield AL10 9AB, Herts, England
[2] Univ Strathclyde, Dept Phys & Appl Phys, Glasgow G4 0NG, Lanark, Scotland
[3] Czech Tech Univ, FANS, Dept Phys, Prague 11519, Czech Republic
来源：
PHYSICS LETTERS A | 2003年 / 307卷 / 04期
基金：
英国工程与自然科学研究理事会;
关键词：
quantum mechanics; quantum information; quantum measurement;
D O I：
10.1016/S0375-9601(02)01602-X
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Can we establish whether or not two quantum systems have been prepared in the same state? We investigate the possibility of universal unambiguous state comparison. We show that it is impossible to conclusively identify two pure unknown states as being identical, and construct the optimal measurement for conclusively identifying them as being different. We then derive optimal strategies for state comparison when the state of each system is one of two known states. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：189 / 195
页数：7
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