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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 10 — May. 15, 2010
  • pp: 1665–1667

Demonstration of a quantum-enhanced fiber Sagnac interferometer

Moritz Mehmet, Tobias Eberle, Sebastian Steinlechner, Henning Vahlbruch, and Roman Schnabel  »View Author Affiliations

Optics Letters, Vol. 35, Issue 10, pp. 1665-1667 (2010)

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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.

© 2010 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(270.0270) Quantum optics : Quantum optics
(270.6570) Quantum optics : Squeezed states

ToC Category:
Quantum Optics

Original Manuscript: March 1, 2010
Manuscript Accepted: April 8, 2010
Published: May 10, 2010

Moritz Mehmet, Tobias Eberle, Sebastian Steinlechner, Henning Vahlbruch, and Roman Schnabel, "Demonstration of a quantum-enhanced fiber Sagnac interferometer," Opt. Lett. 35, 1665-1667 (2010)

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