Composable security for continuous variable quantum key distribution: Trust levels and practical key rates in wired and wireless networks

• URL: http://arxiv.org/abs/2203.00706v1
• Date: Tue, 1 Mar 2022 19:04:43 GMT
• Title: Composable security for continuous variable quantum key distribution: Trust levels and practical key rates in wired and wireless networks
• Authors: Stefano Pirandola
• Abstract summary: Continuous variable (CV) quantum key distribution (QKD) provides a powerful setting for secure quantum communications. We study the composable finite-size security of CV-QKD with Gaussian-modulated coherent-state protocols. We show that high key rates are achievable for short-range optical wireless (LiFi) in secure quantum networks with both fixed and mobile devices.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Continuous variable (CV) quantum key distribution (QKD) provides a powerful setting for secure quantum communications, thanks to the use of room-temperature off-the-shelf optical devices and the potential to reach much higher rates than the standard discrete-variable counterpart. In this work, we provide a general framework for studying the composable finite-size security of CV-QKD with Gaussian-modulated coherent-state protocols under various levels of trust for the loss and noise experienced by the parties. Our study considers both wired (i.e., fiber-based) and wireless (i.e., free-space) quantum communications. In the latter case, we show that high key rates are achievable for short-range optical wireless (LiFi) in secure quantum networks with both fixed and mobile devices. Finally, we extend our investigation to microwave wireless (WiFi) discussing security and feasibility of CV-QKD for very short-range applications.

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