期刊
SCIENCE
卷 337, 期 6101, 页码 1514-1517出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1225258
关键词
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资金
- Project for Developing Innovation Systems
- Global Center of Excellence
- Advanced Photon Science Alliance
- Funding Program for World-Leading Innovative R&D on Science and Technology
- Ministry of Internal Affairs and Communications of Japan
- Australian Research Council [CE110001029, DP1094650, FT100100761]
- Grants-in-Aid for Scientific Research [22560439, 23244080] Funding Source: KAKEN
- Australian Research Council [FT100100761, DP1094650] Funding Source: Australian Research Council
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.
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