Numerical Security Analysis for Practical Quantum Key Distribution

Quantum key distribution QKD promises information-theoretic security based on quantum mechanics and idealized device models. Practical implementations, however, deviate from these models due to unavoidable device imperfections, and existing security proofs fall short of capturing the complexity o...

Security of Decoy-State Quantum Key Distribution with Correlated Bit-And-Basis Encoders

Practical quantum key distribution QKD modulators inevitably introduce correlations, causing the state emitted in a given round to depend on the setting choices made in previous rounds. These correlations break the round-by-round independence structure on which many widely used security proof...

Quantum Bit Error Rate Analysis in BB84 Quantum Key Distribution: Measurement, Statistical Estimation, and Eavesdropping Detection

Quantum Key Distribution QKD provides information-theoretic security by exploiting the principles of quantum mechanics. Among QKD protocols, the BB84 scheme remains the most widely adopted for both theoretical research and practical implementation. A critical parameter determining the reliability...

Finite-Key Security Analysis of the Decoy-State BB84 QKD with Passive Measurement

The decoy-state Bennett-Brassard 1984 BB84 quantum key distribution QKD protocol is widely regarded as the de facto standard for practical implementations. On the receiver side, passive basis choice is attractive because it significantly reduces the need for random number generators and eliminate...

Realistic Vulnerabilities of Decoy-State Quantum Key Distribution

We analyze realistic vulnerabilities of decoy-state quantum key distribution QKD arising from the combination of laser damage attack LDA and unambiguous state discrimination USD. While decoy-state QKD is designed to protect against photon-number-splitting and beam-splitting attacks by accurately...