DOI: 10.1126/science.1138007. Beating the Standard Quantum Limit with Four-Entangled Photons

Beating the Standard Quantum Limit with Four-Entangled Photons

10.1126/science.1138007

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

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.

Bibliography

Nagata, T., Okamoto, R., OâBrien, J. L., Sasaki, K., & Takeuchi, S. (2007). Beating the Standard Quantum Limit with Four-Entangled Photons. Science, 316(5825), 726â729.

Authors 5

Tomohisa Nagata (first)
Ryo Okamoto (additional)
Jeremy L. O'Brien (additional)
Keiji Sasaki (additional)
Shigeki Takeuchi (additional)

References 33 Referenced 651

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The visibility V ≡ ( max – min )/( max + min ) where max and min are the extreme values of the sinusoidal multiphoton interference fringe; 0 ≤ V ≤ 1 .
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We thank H. F. Hofmann K. J. Pregnell G. J. Pryde J. G. Rarity K. J. Resch and A. G. White for helpful discussions. This work was supported by the Japan Science and Technology Agency (JST) Ministry of Internal affairs and Communication (MIC) Japan Society for the Promotion of Science (JSPS) 21st Century Centers of Excellence program Special Coordination Funds for Promoting Science and Technology and the Daiwa Anglo-Japanese Foundation. J.L.O'B. was supported by an Australian Academy of Science–JSPS Fellowship.

Dates

Type	When
Created	18 years, 3 months ago (May 3, 2007, 5:48 p.m.)
Deposited	1 year, 7 months ago (Jan. 10, 2024, 3:41 a.m.)
Indexed	1 minute ago (Aug. 28, 2025, 4:50 p.m.)
Issued	18 years, 3 months ago (May 4, 2007)
Published	18 years, 3 months ago (May 4, 2007)
Published Print	18 years, 3 months ago (May 4, 2007)

Funders 0

None

BibTeX

@article{Nagata_2007, title={Beating the Standard Quantum Limit with Four-Entangled Photons}, volume={316}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1138007}, DOI={10.1126/science.1138007}, number={5825}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Nagata, Tomohisa and Okamoto, Ryo and O’Brien, Jeremy L. and Sasaki, Keiji and Takeuchi, Shigeki}, year={2007}, month=may, pages={726–729} }

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