Trusted detector noise analysis for discrete modulation schemes of continuous-variable quantum key distribution

TL;DR

This paper analyzes the security of discrete-modulated continuous-variable quantum key distribution protocols considering trusted detector noise, demonstrating that realistic noise can be effectively mitigated to achieve near-ideal key rates.

Contribution

It provides the first asymptotic key rate analysis for these protocols under trusted detector noise, bridging the gap between ideal and practical detector scenarios.

Findings

Detector noise can be effectively mitigated in the analysis.

Asymptotic key rates similar to ideal detectors are achievable.

The approach enhances the practicality of quantum key distribution deployments.

Abstract

Discrete-modulated continuous-variable quantum key distribution protocols are promising candidates for large-scale deployment due to the large technological overlap with deployed modern optical communication devices. The security of discrete modulation schemes has previously analyzed in the ideal detector scenario in the asymptotic limit. In this work, we calculate asymptotic key rates against collective attacks in the trusted detector noise scenario. Our results show that we can thus cut out most of the effect of detector noise and obtain asymptotic key rates similar to those had we access to ideal detectors.