Continuous Variable Quantum Key Distribution in Multiple-Input Multiple-Output Settings

• URL: http://arxiv.org/abs/2308.11320v1
• Date: Tue, 22 Aug 2023 09:52:33 GMT
• Title: Continuous Variable Quantum Key Distribution in Multiple-Input Multiple-Output Settings
• Authors: Shradhanjali Sahu, Ahmed Lawey, and Mohsen Razavi
• Abstract summary: We study a $2times2$ setting for continuous variable (CV) QKD with Gaussian encoding and heterodyne detection and reverse reconciliation. We show that we can achieve multiplexing gain using multiple transmitters and receivers even if there is some crosstalk between the two channels.
• Score: 0.40964539027092906
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate quantum key distribution (QKD) in optical multiple-input-multiple-output (MIMO) settings. Such settings can prove useful in dealing with harsh channel conditions as in, e.g., satellite-based QKD. We study a $2\times2$ setting for continuous variable (CV) QKD with Gaussian encoding and heterodyne detection and reverse reconciliation. We present our key rate analysis for this system and compare it with single-mode and multiplexed CV QKD scenarios. We show that we can achieve multiplexing gain using multiple transmitters and receivers even if there is some crosstalk between the two channels. In certain cases, when there is nonzero correlated excess noise in the two received signals, we can even surpass the multiplexing gain.

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