Beating the standard quantum limit with four-entangled photons

Tomohisa Nagata; Ryo Okamoto; Jeremy L. O'Brien; Keiji Sasaki; Shigeki Takeuchi

doi:10.1126/science.1138007

Beating the standard quantum limit with four-entangled photons

Tomohisa Nagata, Ryo Okamoto, Jeremy L. O'Brien, Keiji Sasaki, Shigeki Takeuchi

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

663 Citations (Scopus)

Abstract

Precision measurements are important across all fields of science. In particular, optical phase measurements can be used to measure distance, position, displacement, acceleration, and optical path length. Quantum entanglement enables higher precision than would otherwise be possible. We demonstrated an optical phase measurement with an entangled four-photon interference visibility greater than the threshold to beat the standard quantum limit - the limit attainable without entanglement. These results open the way for new high-precision measurement applications.

Original language	English
Pages (from-to)	726-729
Number of pages	4
Journal	Science
Volume	316
Issue number	5825
DOIs	https://doi.org/10.1126/science.1138007
Publication status	Published - 4 May 2007
Externally published	Yes

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AU - Takeuchi, Shigeki

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Beating the standard quantum limit with four-entangled photons

Abstract

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