Quantum-Enhanced Optical-Phase Tracking

被引：192

作者：

Yonezawa, Hidehiro ^{[3
]}

Nakane, Daisuke ^{[3
]}

Wheatley, Trevor A. ^{[2
,3
,5
]}

Iwasawa, Kohjiro ^{[3
]}

Takeda, Shuntaro ^{[3
]}

Arao, Hajime ^{[3
]}

Ohki, Kentaro ^{[6
]}

Tsumura, Koji ^{[7
]}

Berry, Dominic W. ^{[8
,9
]}

Ralph, Timothy C. ^{[2
,10
]}

Wiseman, Howard M. ^{[1
,4
]}

Huntington, Elanor H. ^{[2
,5
]}

Furusawa, Akira ^{[3
]}

机构：

[1] Griffith Univ, Ctr Quantum Dynam, Brisbane, Qld 4111, Australia

[2] Australian Res Council, Ctr Quantum Computat & Commun Technol, Canberra, ACT, Australia

[3] Univ Tokyo, Dept Appl Phys, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

[4] Griffith Univ, Ctr Quantum Computat & Commun Technol, Brisbane, Qld 4111, Australia

[5] Univ New S Wales, Sch Engn & Informat Technol, Univ Coll, Canberra, ACT 2600, Australia

[6] Kyoto Univ, Dept Appl Math & Phys, Sch Informat, Sakyo Ku, Kyoto 6068501, Japan

[7] Univ Tokyo, Dept Informat Phys & Comp, Bunkyo Ku, Tokyo 1130033, Japan

[8] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada

[9] Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia

[10] Univ Queensland, Sch Math & Phys, Brisbane, Qld 4072, Australia

来源：

SCIENCE | 2012年 / 337卷 / 6101期

基金：

澳大利亚研究理事会;

关键词：

LIMIT;

D O I：

10.1126/science.1225258

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：

Tracking a randomly varying optical phase is a key task in metrology, with applications in optical communication. The best precision for optical-phase tracking has until now been limited by the quantum vacuum fluctuations of coherent light. Here, we surpass this coherent-state limit by using a continuous-wave beam in a phase-squeezed quantum state. Unlike in previous squeezing-enhanced metrology, restricted to phases with very small variation, the best tracking precision (for a fixed light intensity) is achieved for a finite degree of squeezing because of Heisenberg's uncertainty principle. By optimizing the squeezing, we track the phase with a mean square error 15 +/- 4% below the coherent-state limit.

引用

页码：1514 / 1517

页数：4

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