Entanglement is not very useful for estimating multiple phases

被引：41

作者：

Ballester, MA ^{[1
]}

机构：

[1] Univ Utrecht, Dept Math, NL-3508 TA Utrecht, Netherlands

来源：

PHYSICAL REVIEW A | 2004年 / 70卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.70.032310

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The problem of the estimation of multiple phases (or of commuting unitaries) is considered. This is a submodel of the estimation of a completely unknown unitary operation where it has been shown in recent works that there are considerable improvements by using entangled input states and entangled measurements. Here it is shown that, when estimating commuting unitaries, there is practically no advantage in using entangled input states or entangled measurements.

引用

页码：032310 / 1

页数：6

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