Improvement of frequency standards with quantum entanglement

被引：821

作者：

Huelga, SF

Macchiavello, C

Pellizzari, T

Ekert, AK

Plenio, MB

Cirac, JI

机构：

[1] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, BLACKETT LAB, OPT SECT, LONDON SW7 2BZ, ENGLAND

[2] UNIV INNSBRUCK, INST THEORET PHYS, A-6020 INNSBRUCK, AUSTRIA

[3] UNIV OVIEDO, DEPT FIS, E-33007 OVIEDO, SPAIN

[4] ISI FDN, I-10133 TURIN, ITALY

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.79.3865

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The optimal precision of frequency measurements in the presence of decoherence is discussed. analyze different preparations of n two-level systems as well as different measurement procedures. We show that standard Ramsey spectroscopy on uncorrelated atoms and optimal measurements on maximally entangled states provide the same resolution. The best resolution is achieved using partially entangled preparations with a high degree of symmetry.

引用

页码：3865 / 3868

页数：4

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