Entanglement and Sensitivity in Precision Measurements with States of a Fluctuating Number of Particles

被引：84

作者：

Hyllus, P. ^{[1
,2
]}

Pezze, L. ^{[3
,4
]}

Smerzi, A. ^{[1
,2
]}

机构：

[1] Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy

[2] Univ Trento, Dipartimento Fis, I-38123 Povo, Italy

[3] Univ Paris Sud, F-91127 Palaiseau, France

[4] CNRS, Lab Charles Fabry, Inst Opt, I-38123 Povo, Italy

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 12期

关键词：

QUANTUM LIMIT; NOISE;

D O I：

10.1103/PhysRevLett.105.120501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The concepts of separability, entanglement, spin squeezing, and the Heisenberg limit are central in the theory of quantum-enhanced metrology. In the current literature, these are well established only in the case of linear interferometers operating with input quantum states of a known fixed number of particles. This manuscript generalizes these concepts and extends the quantum phase estimation theory by taking into account classical and quantum fluctuations of the particle number. Our analysis concerns most of the current experiments on precision measurements where the number of particles is known only on average.

引用

页数：4

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