Security of Multi-User Quantum Key Distribution with Discrete-Modulated Continuous-Variables

• URL: http://arxiv.org/abs/2406.14610v1
• Date: Thu, 20 Jun 2024 18:00:01 GMT
• Title: Security of Multi-User Quantum Key Distribution with Discrete-Modulated Continuous-Variables
• Authors: Florian Kanitschar, Christoph Pacher,
• Abstract summary: This work proposes a natural generalization of a well-established point-to-point discrete-modulated continuous-variable (CV) QKD protocol to the point-to-multipoint setting. Our study shows that discrete-modulated CV-QKD is a suitable candidate to connect several dozens of users in a point-to-multipoint network, achieving high rates at a reduced cost.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The conventional point-to-point setting of a Quantum Key Distribution (QKD) protocol typically considers two directly connected remote parties that aim to establish secret keys. This work proposes a natural generalization of a well-established point-to-point discrete-modulated continuous-variable (CV) QKD protocol to the point-to-multipoint setting. We explore four different trust levels among the communicating parties and provide secure key rates for the loss-only channel and the lossy \& noisy channel in the asymptotic limit. Our study shows that discrete-modulated CV-QKD is a suitable candidate to connect several dozens of users in a point-to-multipoint network, achieving high rates at a reduced cost, using off-the-shelf components employed in modern communication infrastructure.

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