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Applied Physics B

, Volume 98, Issue 4, pp 635–640 | Cite as

Atmospheric channel characteristics for quantum communication with continuous polarization variables

  • B. Heim
  • D. Elser
  • T. Bartley
  • M. Sabuncu
  • C. Wittmann
  • D. Sych
  • C. Marquardt
  • G. Leuchs
Open Access
Article

Abstract

We investigate the properties of an atmospheric channel for free space quantum communication with continuous polarization variables. In our prepare-and-measure setup, coherent polarization states are transmitted through an atmospheric quantum channel of 100 m length on the flat roof of our institute’s building. The signal states are measured by homodyne detection with the help of a local oscillator (LO) which propagates in the same spatial mode as the signal, orthogonally polarized to it. Thus the interference of signal and LO is excellent and atmospheric fluctuations are auto-compensated. The LO also acts as a spatial and spectral filter, which allows for unrestrained daylight operation. Important characteristics for our system are atmospheric channel influences that could cause polarization, intensity and position excess noise. Therefore we study these influences in detail. Our results indicate that the channel is suitable for our quantum communication system in most weather conditions.

Keywords

Intensity Noise Quantum Communication Local Oscillator Excess Noise Beam Center 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Author(s) 2009

Authors and Affiliations

  • B. Heim
    • 1
    • 2
  • D. Elser
    • 1
    • 2
  • T. Bartley
    • 1
    • 2
    • 3
  • M. Sabuncu
    • 1
    • 2
  • C. Wittmann
    • 1
    • 2
  • D. Sych
    • 1
    • 2
  • C. Marquardt
    • 1
    • 2
  • G. Leuchs
    • 1
    • 2
  1. 1.Max Planck Institute for the Science of LightErlangenGermany
  2. 2.Institute of Optics, Information and PhotonicsUniversity of Erlangen-NurembergErlangenGermany
  3. 3.Clarendon LaboratoryUniversity of OxfordOxfordUK

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