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Author  |
Yonezawa, H.; Nakane, D.; Wheatley, T.A.; Iwasawa, K.; Takeda, S.; Arao, H.; Ohki, K.; Tsumura, K.; Berry, D.W.; Ralph, T.C.; Wiseman, H.M.; Huntington, E.H.; Furusawa, A. |
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Title |
Quantum-Enhanced Optical-Phase Tracking |
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Journal Article |
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Year |
2012 |
Publication |
SCIENCE |
Abbreviated Journal |
Science |
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Volume |
337 |
Issue |
6101 |
Pages |
1514-1517 |
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Abstract |
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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Address |
[Wiseman, Howard M.] Griffith Univ, Ctr Quantum Dynam, Brisbane, Qld 4111, Australia, Email: h.wiseman@griffith.edu.au; |
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Publisher |
AMER ASSOC ADVANCEMENT SCIENCE |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
0036-8075 |
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Notes |
WOS:000308912900045 |
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no |
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Call Number |
IQC @ it @ |
Serial |
2877 |
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