Optimal measurements for relative quantum information

被引：40

作者：

Bartlett, SD ^{[1
]}

Rudolph, T

Spekkens, RW

机构：

[1] Univ Queensland, Sch Phys Sci, Brisbane, Qld 4072, Australia

[2] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Opt Sect, London SW7 2BZ, England

[3] Perimeter Inst Theoret Phys, Waterloo, ON N2J 2W9, Canada

来源：

PHYSICAL REVIEW A | 2004年 / 70卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevA.70.032321

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We provide optimal measurement schemes for estimating relative parameters of the quantum state of a pair of spin systems. We prove that the optimal measurements are joint measurements on the pair of systems, meaning that they cannot be achieved by local operations and classical communication. We also demonstrate that in the limit where one of the spins becomes macroscopic, our results reproduce those that are obtained by treating that spin as a classical reference direction.

引用

页码：032321 / 1

页数：5

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