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Polarization Insensitive 100 MHz Clock Subcarrier Quantum Key Distribution over a 45 dB Loss Optical Fiber Channel

Artur V. Gleim, V. I. Egorov, Yuri V. Nazarov, Semen V. Smirnov, Vladimir Chistiakov, O. I. Bannik, A. A. Anisimov, S. M. Kynev, Robert John Collins, S. A. Kozlov, Gerald S. Buller

Published Jan 1, 2015• 3 citations
Publisher

Abstract

We experimentally demonstrate quantum key distribution at 28 bit/s rate in a telecommunications fiber channel with 45 dB loss using a subcarrier wave approach. This approach offers polarization independency, high bitrates and wide multiplexing capabilities.
DOI
10.1364/cleo_qels.2015.ff1a.5

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A quantum key distribution system based on the subcarrier wave modulation method has been demonstrated which employs the BB84 protocol with a strong reference to generate secure bits at a rate of 16.5 kbit/s with an error of 0.5% over an optical channel of 10 dB loss, and 18 bits/s with an error of 0.75% over 25 dB of channel loss. To the best of our knowledge, these results represent the highest channel loss reported for secure quantum key distribution using the subcarrier wave approach. A passive unidirectional scheme has been used to compensate for the polarization dependence of the phase modulators in the receiver module, which resulted in a high visibility of 98.8%. The system is thus fully insensitive to polarization fluctuations and robust to environmental changes, making the approach promising for use in optical telecommunication networks. Further improvements in secure key rate and transmission distance can be achieved by implementing the decoy states protocol or by optimizing the mean photon number used in line with experimental parameters.
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