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

Ruppert L, Peuntinger C, Heim B, Günthner K, Usenko VC, Elser DA, Leuchs G, Filip R, Marquardt C (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Book Volume: 21

Journal Issue: 12

DOI: 10.1088/1367-2630/ab5dd3

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.

Authors with CRIS profile

Involved external institutions

Palacky University Olomouc / Univerzita Palackého v Olomouci Czech Republic (CZ) Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light Germany (DE)

How to cite

APA:

Ruppert, L., Peuntinger, C., Heim, B., Günthner, K., Usenko, V.C., Elser, D.A.,... Marquardt, C. (2019). Fading channel estimation for free-space continuous-variable secure quantum communication. New Journal of Physics, 21(12). https://doi.org/10.1088/1367-2630/ab5dd3

MLA:

Ruppert, Laszlo, et al. "Fading channel estimation for free-space continuous-variable secure quantum communication." New Journal of Physics 21.12 (2019).

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