Refined finite-size analysis of binary-modulation continuous-variable quantum key distribution

Abstract

Recent studies showed the finite-size security of binary-modulation CV-QKD protocols against general attacks. However, they gave poor key-rate scaling against transmission distance. Here, we extend the security proof based on complementarity, which is used in the discrete-variable QKD, to the previously developed binary-modulation CV-QKD protocols with the reverse reconciliation under the finite-size regime and obtain large improvements in the key rates. Notably, the key rate in the asymptotic limit scales linearly against the attenuation rate, which is known to be optimal scaling but is not achieved in previous finite-size analyses. This refined security approach may offer full-fledged security proofs for other discrete-modulation CV-QKD protocols.

32 pages, 3 figures, accepted version

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Cited by in corpus (7)

• Continuous-variable quantum key distribution system: past, present, and future
• Experimental demonstration of Continuous-Variable Quantum Key Distribution with a silicon photonics integrated receiver
• Security of discrete-modulated continuous-variable quantum key distribution
• Improved finite-size key rates for discrete-modulated continuous variable quantum key distribution under coherent attacks
• Tight concentration inequalities for quantum adversarial setups exploiting permutation symmetry
• Pilot-reference-free continuous-variable quantum key distribution with efficient decoy-state analysis
• Security loophole in error verification in quantum key distribution