Effective discrete-modulated continuous variable QKD under general attacks

• URL: http://arxiv.org/abs/2606.20346v1
• Date: Thu, 18 Jun 2026 15:15:12 GMT
• Title: Effective discrete-modulated continuous variable QKD under general attacks
• Abstract summary: Continuous variable quantum key distribution via discrete modulations ensures information-theoretic security.<n>Existing security proofs against general attacks often rely on restrictive assumptions.<n>We develop a finite-size security analysis that removes these limitations while incorporating realistic experimental features.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Continuous variable quantum key distribution via discrete modulations ensures information-theoretic security using standard telecom technologies, providing affordable and scalable quantum communications with simplified classical postprocessing. However, existing security proofs against general attacks often rely on restrictive assumptions, such as a bounded dimension for coherent states, or require impractically large block sizes. In this work, we develop a finite-size security analysis that removes these limitations while incorporating realistic experimental features. Our approach combines the dimension reduction technique, a security proof based on the marginal-constrained entropy accumulation, and a trusted detector model accounting for the receiver imperfections. We report positive key rates in the finite-size regime for relevant block sizes of the order of $10^8$. These results contribute to narrowing the gap between theoretical security proofs and practical implementations of discrete-modulated continuous variable quantum key distribution protocols.

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