Fidelity balance in quantum operations

被引：148

作者：

Banaszek, K

机构：

[1] Univ Rochester, Ctr Quantum Informat, Rochester, NY 14627 USA

[2] Univ Rochester, Rochester Theory Ctr Opt Sci & Engn, Rochester, NY 14627 USA

[3] Warsaw Univ, Inst Fizyki Teoretycznej, PL-00681 Warsaw, Poland

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 07期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.86.1366

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

I derive a tight bound between the quality of estimating the state of a single copy of a tl-level system, and the degree the initial state has to be altered in the course of this procedure. This result provides a complete analytical description of the quantum mechanical trade-off between the information gain and the quantum state disturbance expressed in terms of mean fidelities. I also discuss consequences of this bound for quantum teleportation using nonmaximally entangled states.

引用

页码：1366 / 1369

页数：4

共 18 条

[1] Optimal generalized quantum measurements for arbitrary spin systems -: art. no. 022113 [J].