Optimal partial estimation of multiple phases -: art. no. 012311

被引：27

作者：

Mista, L ^{[1
]}

Fiurásek, J ^{[1
]}

Filip, R ^{[1
]}

机构：

[1] Palacky Univ, Dept Opt, CR-77147 Olomouc, Czech Republic

来源：

PHYSICAL REVIEW A | 2005年 / 72卷 / 01期

关键词：

D O I：

10.1103/PhysRevA.72.012311

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We derive the optimal trade-off between the estimation fidelity and the fidelity of the state after the estimation for a single copy of an unknown pure state of a d-level system belonging to a specific subset of the set of all pure states. The set of states to be considered here is formed by all pure states of a d-level system produced by d-independent phase shifts of some reference state. We also propose a measurement scheme realizing such an optimal partial estimation of multiple phases in which the trade-off between the fidelities can be controlled by the state of the ancilla.

引用

页数：6

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