Quantum-Enhanced Optical-Phase Tracking

Hidehiro Yonezawa; Daisuke Nakane; Trevor A. Wheatley; Kohjiro Iwasawa; Shuntaro Takeda; Hajime Arao; Kentaro Ohki; Koji Tsumura; Dominic W. Berry; Timothy C. Ralph; Howard M. Wiseman; Elanor H. Huntington; Akira Furusawa

doi:10.1126/science.1225258

Quantum-Enhanced Optical-Phase Tracking

Hidehiro Yonezawa, Daisuke Nakane, Trevor A. Wheatley, Kohjiro Iwasawa, Shuntaro Takeda, Hajime Arao, Kentaro Ohki, Koji Tsumura, Dominic W. Berry, Timothy C. Ralph, Howard M. Wiseman^*, Elanor H. Huntington, Akira Furusawa

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

191 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1514-1517
Number of pages	4
Journal	Science
Volume	337
Issue number	6101
DOIs	https://doi.org/10.1126/science.1225258
Publication status	Published - 21 Sept 2012
Externally published	Yes

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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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AU - Yonezawa, Hidehiro

AU - Nakane, Daisuke

AU - Wheatley, Trevor A.

AU - Iwasawa, Kohjiro

AU - Takeda, Shuntaro

AU - Arao, Hajime

AU - Ohki, Kentaro

AU - Tsumura, Koji

AU - Berry, Dominic W.

AU - Ralph, Timothy C.

AU - Wiseman, Howard M.

AU - Huntington, Elanor H.

AU - Furusawa, Akira

PY - 2012/9/21

Y1 - 2012/9/21

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Quantum-Enhanced Optical-Phase Tracking

Abstract

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