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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 12 — Jun. 15, 2012
  • pp: 2367–2369

Continuous-wave nonclassical light with gigahertz squeezing bandwidth

Stefan Ast, Aiko Samblowski, Moritz Mehmet, Sebastian Steinlechner, Tobias Eberle, and Roman Schnabel  »View Author Affiliations

Optics Letters, Vol. 37, Issue 12, pp. 2367-2369 (2012)

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Squeezed states can be employed for entanglement-based continuous-variable quantum key distribution, where the secure key rate is proportional to the bandwidth of the squeezing. We produced a nonclassical cw laser field at the telecommunication wavelength of 1550 nm, which showed squeezing over a bandwidth of more than 2 GHz. The experimental setup used parametric downconversion via a periodically poled potassium titanyl phosphate crystal. We did not use any resonant enhancement for the fundamental wavelength, which should in principle allow a production of squeezed light over the full phase-matching bandwidth of several nanometers. We measured the squeezing to be up to 0.3 dB below the vacuum noise from 50 MHz to 2 GHz limited by the measuring bandwidth of the homodyne detector. The squeezing strength was possibly limited by thermal lensing inside the nonlinear crystal.

© 2012 Optical Society of America

OCIS Codes
(060.2920) Fiber optics and optical communications : Homodyning
(270.5570) Quantum optics : Quantum detectors
(270.6570) Quantum optics : Squeezed states
(060.5565) Fiber optics and optical communications : Quantum communications
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: January 26, 2012
Revised Manuscript: April 10, 2012
Manuscript Accepted: April 26, 2012
Published: June 12, 2012

Stefan Ast, Aiko Samblowski, Moritz Mehmet, Sebastian Steinlechner, Tobias Eberle, and Roman Schnabel, "Continuous-wave nonclassical light with gigahertz squeezing bandwidth," Opt. Lett. 37, 2367-2369 (2012)

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