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
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
收藏
页码:1514 / 1517
页数:4
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