Atmospheric channel characteristics for quantum communication with continuous polarization variables |
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Authors: | B Heim D Elser T Bartley M Sabuncu C Wittmann D Sych C Marquardt G Leuchs |
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Institution: | 1. Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, Bau 24, 91058, Erlangen, Germany 2. Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Staudtstr. 7/B2, 91058, Erlangen, Germany 3. Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, England, UK
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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. |
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