research
Continuous-Variable QKD Closed Its Coherent-Attack Gap
A composable finite-size proof retained positive modeled key rates beyond 70 kilometers with imperfect detectors.
Summary
A composable finite-size proof retained positive modeled key rates beyond 70 kilometers with imperfect detectors.
Discrete-modulated continuous-variable quantum key distribution has used experimentally attractive telecom components without a complete finite-size proof against coherent attacks. This work introduces an infinite-dimensional entropy accumulation theorem and a dimension-reduction method, covering imperfect detectors and fixed- or variable-length protocols. The computed bounds recover known asymptotic rates and remain positive beyond 70 kilometers for the reported block sizes and parameters. It is a security proof and numerical result, not a field deployment.
Why it matters
A composable finite-size proof retained positive modeled key rates beyond 70 kilometers with imperfect detectors.
Limits and context
- The computed bounds recover known asymptotic rates and remain positive beyond 70 kilometers for the reported block sizes and parameters.
- It is a security proof and numerical result, not a field deployment.
Key claims
A composable finite-size proof retained positive modeled key rates beyond 70 kilometers with imperfect detectors.
Qualification: The computed bounds recover known asymptotic rates and remain positive beyond 70 kilometers for the reported block sizes and parameters.
Evidence: source-2026-09-16-017
Sources
- arXiv preprint 2609.16105arXiv · primary research
Corrections
No corrections have been recorded for this story.