Optimal Quantum Phase Estimation

被引：399

作者：

Dorner, U. ^{[1
]}

Demkowicz-Dobrzanski, R. ^{[2
]}

Smith, B. J. ^{[1
]}

Lundeen, J. S. ^{[1
]}

Wasilewski, W. ^{[3
]}

Banaszek, K. ^{[2
]}

Walmsley, I. A. ^{[1
]}

机构：

[1] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[2] Nicholas Copernicus Univ, Inst Phys, PL-87100 Torun, Poland

[3] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

LIMIT; ENTANGLEMENT; STATES;

D O I：

10.1103/PhysRevLett.102.040403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By using a systematic optimization approach, we determine quantum states of light with definite photon number leading to the best possible precision in optical two-mode interferometry. Our treatment takes into account the experimentally relevant situation of photon losses. Our results thus reveal the benchmark for precision in optical interferometry. Although this boundary is generally worse than the Heisenberg limit, we show that the obtained precision beats the standard quantum limit, thus leading to a significant improvement compared to classical interferometers. We furthermore discuss alternative states and strategies to the optimized states which are easier to generate at the cost of only slightly lower precision.

引用

页数：4

共 22 条

[1] Optimal frequency measurements with maximally correlated states [J].