The Influence of Signal Polarization on Quantum Bit Error Rate for Subcarrier Wave Quantum Key Distribution Protocol |
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| Authors: | Andrei Gaidash Anton Kozubov Svetlana Medvedeva George Miroshnichenko |
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| Institution: | 1.Department of Mathematical Methods for Quantum Technologies, Steklov Mathematical Institute of Russian Academy of Sciences, Moscow 119991, Russia; (A.G.); (A.K.);2.Laboratory of Quantum Processes and Measurements, ITMO University, Saint Petersburg 199034, Russia;3.Faculty of Laser Photonics and Optoelectronics, ITMO University, Saint Petersburg 197101, Russia; |
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| Abstract: | In this paper, we consider the influence of a divergence of polarization of a quantum signal transmitted through an optical fiber channel on the quantum bit error rate of the subcarrier wave quantum key distribution protocol. Firstly, we investigate the dependence of the optical power of the signal on the modulation indices’ difference after the second phase modulation of the signal. Then we consider the Liouville equation with regard to relaxation in order to develop expressions of the dynamics of the Stokes parameters. As a result, we propose a model that describes quantum bit error rate for the subcarrier wave quantum key distribution depending on the characteristics of the optical fiber. Finally, we propose several methods for minimizing quantum bit error rate. |
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| Keywords: | quantum optics quantum key distribution polarization Stokes parameters dissipative dynamics |
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