Security Analysis of Continuous-Variable Quantum Key Distribution Systems with Imperfect Photon Subtraction

Security framework for practical quantum key distribution with imperfect devices

This work presents a security proof for generic prepare-and-measure QKD protocols, including decoy-state BB84, with imperfect and imperfectly characterized sources and detectors using the marginal-constrained entropy accumulation theorem (MEAT).

The security of practical post-selection in Gaussian-modulated continuous-variable quantum key distribution

Gaussian-modulated coherent-state (GMCS) continuous-variable quantum key distribution (CV-QKD) offers a practical path to quantum-secured communication owing to its compatibility with existing optical fibre networks and use of mature security proofs. Achieving high secret key rates in real-time systems, however, re...

Using Holevo bound for leakage estimation in quantum key distribution

It is shown that general post-selective soft-filtering transformations of side-channel states can be consistently incorporated into the GLLP and Koashi framework, and a Holevo-based upper bound on the eavesdropper's information for decoy-state BB84 is derived.

Afterpulse analysis for practical phase-matching quantum key distribution

QUEST: A Simulation-Based QKD Architecture with Eight-State Time-Bin Modulation and Adaptive Homodyne–Heterodyne Detection

ModPhase-8 is introduced, a proposed QKD modulation and adaptive-receiver architecture evaluated through analytical modeling and simulation that provides an analytical security assessment under the stated collective-attack, source, channel, receiver, and trusted-device assumptions, supplemented by attack-specific analy...

Rigorous phase-error-estimation security framework for QKD with correlated sources

Practical QKD modulators introduce correlations between consecutively emitted pulses due to bandwidth limitations, violating key assumptions underlying many security proof techniques. Here, we address this problem by introducing a simple yet powerful mathematical framework to directly extend phase-error-estimation-base...