Universal programmable quantum state discriminator that is optimal for unambiguously distinguishing between unknown states

被引:81
作者
Bergou, JA [1 ]
Hillery, M [1 ]
机构
[1] CUNY Hunter Coll, Dept Phys, New York, NY 10021 USA
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevLett.94.160501
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We construct a device that can unambiguously discriminate between two unknown quantum states. The unknown states are provided as inputs, or programs, for the program registers, and a third system, which is guaranteed to be prepared in one of the states stored in the program registers, is fed into the data register of the device. The device will then, with some probability of success, tell us whether the unknown state in the data register matches the state stored in the first or the second program register. We show that the optimal device, i.e., the one that maximizes the probability of success, is universal. It does not depend on the actual unknown states that we wish to discriminate.
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页数:4
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