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  Demonstration of a quantum-enhanced fiber Sagnac interferometer

Mehmet, M., Eberle, T., Steinlechner, S., Vahlbruch, H., & Schnabel, R. (2010). Demonstration of a quantum-enhanced fiber Sagnac interferometer. Optics Letters, 35(10), 1665-1667. doi:10.1364/OL.35.001665.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-BB06-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-BB07-2
Genre: Journal Article

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Mehmet, Moritz1, Author              
Eberle, Tobias1, Author              
Steinlechner, Sebastian1, Author              
Vahlbruch, Henning1, Author              
Schnabel, Roman1, Author              
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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 Abstract: The injection of squeezed light can be used to improve the sensitivity of an interferometer beyond the limit imposed by the zero-point fluctuation of the electromagnetic field. Here, we report on the realization of such a quantum-enhanced interferometer with a fiber-based Sagnac topology. Continuous wave squeezed states at 1550 nm with a noise reduction of 6.4 dB below shot noise were produced by type I optical parametric amplification and subsequently injected into the dark port of the interferometer. A reduction of the interferometer shot noise by 4.5 dB was observed, and the enhancement of the signal-to-noise ratio for a phase modulation signal generated within the interferometer could be demonstrated. We achieved a 95% fiber transmission for the squeezed states, which suggests that corresponding fiber-based quantum metrology and communication systems are feasible.

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 Dates: 2010
 Publication Status: Published in print
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 Identifiers: DOI: 10.1364/OL.35.001665
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Title: Optics Letters
Source Genre: Journal
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Pages: - Volume / Issue: 35 (10) Sequence Number: - Start / End Page: 1665 - 1667 Identifier: -