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Fading channel estimation for free-space continuous-variable secure quantum communication

MPS-Authors
/persons/resource/persons201153

Peuntinger,  Christian
Christoph Marquardt Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Institute for Optics, Information and Photonics, Friedrich-Alexander University Erlangen-Nürnberg;
inno-spec GmbH;

/persons/resource/persons216205

Günthner,  Kevin
Christoph Marquardt Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Institute for Optics, Information and Photonics, Friedrich-Alexander University Erlangen-Nürnberg;

/persons/resource/persons201053

Elser,  Dominique
Christoph Marquardt Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Institute for Optics, Information and Photonics, Friedrich-Alexander University Erlangen-Nürnberg;

/persons/resource/persons201115

Leuchs,  Gerd
Institute for Optics, Information and Photonics, Friedrich-Alexander University Erlangen-Nürnberg;
Emeritus Group Leuchs, Emeritus Groups, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201126

Marquardt,  Christoph
Christoph Marquardt Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Institute for Optics, Information and Photonics, Friedrich-Alexander University Erlangen-Nürnberg;

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Citation

Ruppert, L., Peuntinger, C., Heim, B., Günthner, K., Usenko, V. C., Elser, D., et al. (2019). Fading channel estimation for free-space continuous-variable secure quantum communication. New Journal of Physics, (21): 123036. doi:10.1088/1367-2630/ab5dd3.


Cite as: http://hdl.handle.net/21.11116/0000-0005-83D5-6
Abstract
We investigate estimation of fluctuating channels and its effect on security of continuous-variable quantum key distribution. We propose a novel estimation scheme which is based on the clusterization of the estimated transmittance data. We show that uncertainty about whether the transmittance is fixed or not results in a lower key rate. However, if the total number of measurements is large, one can obtain using our method a key rate similar to the non-fluctuating channel even for highly fluctuating channels. We also verify our theoretical assumptions using experimental data from an atmospheric quantum channel. Our method is therefore promising for secure quantum communication over strongly fluctuating turbulent atmospheric channels.