Plug&Play subcarrier wave quantum key distribution with deep modulation

• URL: http://arxiv.org/abs/2111.04546v1
• Date: Mon, 8 Nov 2021 14:55:58 GMT
• Title: Plug&Play subcarrier wave quantum key distribution with deep modulation
• Abstract summary: We show how subcarrier encoding operates in a presence of Rayleigh back-scattering in Plug&Play configuration. This deep modulation regime shows reliable quantum communication with losses up to 20 dB and promises a twice increase in secret key generation rate.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report a quantum key distribution using subcarrier wave encoding in Plug&Play configuration. Our detailed study shows how subcarrier encoding operates in a presence of Rayleigh back-scattering, chromatic dispersion and other experimental negative factors that occur in Plug&Play configuration. We propose and experimentally demonstrate a novel regime for the subcarrier wave encoding, where simultaneous detection of two logical states in a single basis is combined with robustness and simplicity of the original protocol. This deep modulation regime shows reliable quantum communication with losses up to 20 dB and promises a twice increase in secret key generation rate in comparison with the original subcarrier wave quantum key distribution in one-way or Plug&Play configurations.

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