Effects of experimental impairments on the security of continuous-variable quantum key distribution

• URL: http://arxiv.org/abs/2305.15918v1
• Date: Thu, 25 May 2023 10:37:33 GMT
• Title: Effects of experimental impairments on the security of continuous-variable quantum key distribution
• Authors: Andres Ruiz-Chamorro, Daniel Cano, Aida Garcia-Callejo, Veronica Fernandez
• Abstract summary: Quantum Key Distribution (QKD) is a cutting-edge communication method that enables secure communication between two parties. CV-QKD is a promising approach to QKD that has several advantages over traditional discrete-variable systems. Despite its potential, CV-QKD systems are highly sensitive to optical and electronic component impairments.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Quantum Key Distribution (QKD) is a cutting-edge communication method that enables secure communication between two parties. Continuous-variable QKD (CV-QKD) is a promising approach to QKD that has several advantages over traditional discrete-variable systems. Despite its potential, CV-QKD systems are highly sensitive to optical and electronic component impairments, which can significantly reduce the secret key rate. In this research, we address this challenge by modeling a CV-QKD system to simulate the impact of individual impairments on the secret key rate. The results show that laser frequency drifts and small imperfections in electro-optical devices such as the beam splitter and the balanced detector have a negative impact on the secret key rate. This provides valuable insights into strategies for optimizing the performance of CV-QKD systems and overcome limitations caused by component impairments. By offering a method to analyze them, the study enables the establishment of quality standards for the components of CV-QKD systems, driving the development of advanced technologies for secure communication in the future.

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