Beating the standard quantum limit with four-entangled photons

被引：622

作者：

Nagata, Tomohisa

Okamoto, Ryo

O'Brien, Jeremy L.

Sasaki, Keiji

Takeuchi, Shigeki ^{[1
]}

机构：

[1] Hokkaido Univ, Res Inst Elect Sci, Sapporo, Hokkaido 0600812, Japan

[2] Japan Sci & Technol Agcy, Kawaguchi, Saitama 3320012, Japan

[3] Univ Bristol, Dept Elect & Elect Engn, Bristol BS8 1UB, Avon, England

[4] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

来源：

SCIENCE | 2007年 / 316卷 / 5825期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1126/science.1138007

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Precision measurements are important across all fields of science. In particular, optical phase measurements can be used to measure distance, position, displacement, acceleration, and optical path length. Quantum entanglement enables higher precision than would otherwise be possible. We demonstrated an optical phase measurement with an entangled four-photon interference visibility greater than the threshold to beat the standard quantum limit-the limit attainable without entanglement. These results open the way for new high-precision measurement applications.

引用

页码：726 / 729

页数：4

共 31 条

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