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  Continuous-wave non-classical light with GHz squeezing bandwidth

Ast, S., Samblowski, A., Mehmet, M., Steinlechner, S., Eberle, T., & Schnabel, R. (2012). Continuous-wave non-classical light with GHz squeezing bandwidth. Optics Letters, 37, 2367-2369. doi:10.1364/OL.37.002367.

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1201.5289 (Preprint), 537KB
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1201.5289
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File downloaded from arXiv at 2013-03-27 09:47
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 Creators:
Ast, Stefan1, Author           
Samblowski, Aiko1, Author           
Mehmet, Moritz1, Author           
Steinlechner, Sebastian1, Author           
Eberle, Tobias1, Author           
Schnabel, Roman1, Author           
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Quantum Physics, quant-ph
 Abstract: 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 non-classical continuous-wave 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
down-conversion via a periodically poled potassium titanyl phosphate crystal
(PPKTP). We did not use any resonant enhancement for the funda- mental
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 non-linear crystal.

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 Dates: 2012-01-252012-04-272012
 Publication Status: Issued
 Pages: 3 pages, 4 figures
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 1201.5289
DOI: 10.1364/OL.37.002367
 Degree: -

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Title: Optics Letters
Source Genre: Journal
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Publ. Info: New York, NY : The Society
Pages: - Volume / Issue: 37 Sequence Number: - Start / End Page: 2367 - 2369 Identifier: ISSN: 0146-9592
CoNE: https://pure.mpg.de/cone/journals/resource/954925474435