Abstract
We study influence of quantum signal polarization distortions in the optical fiber on the interference pattern visibility in a subcarrier wave quantum key distribution system. An optical scheme of the polarization compensation unit is suggested, and dynamics of the QBER depending on the unit architecture is explored.
Highlights
Quantum cryptography allows distributing secure keys in a way that any eavesdropping in the channel is inevitably detected [1]
The distortions of the quantum signal leads to a decrease in visibility of the interference pattern and a subsequent raise of quantum bit error rate (QBER), which is used as a criterion for the detection of eavesdropping in QKD systems
The aim of this work is the development of the optimal scheme of the polarization distortion compensation unit (PDCU) for SCW QKD, and studying the impact of polarization distortions on QBER and the visibility
Summary
Quantum cryptography allows distributing secure keys in a way that any eavesdropping in the channel is inevitably detected [1]. A subcarrier wave quantum key distribution system (SCW QKD) is one the most perspective solutions of that problem [2,3,4,5]. In this system a quantum signal is not generated directly by the source, but it is put to the sideband as a result of the phase-frequency modulation. The distortions of the quantum signal leads to a decrease in visibility of the interference pattern and a subsequent raise of quantum bit error rate (QBER), which is used as a criterion for the detection of eavesdropping in QKD systems
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