A three-state BB84 QKD system with time-bin encoding achieves secure key distribution over 151 km by adapting the loss-tolerant method to account for measured state preparation flaws.
Modeling and Characterization of Arbitrary Order Pulse Correlations for Quantum Key Distribution
5 Pith papers cite this work. Polarity classification is still indexing.
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abstract
In quantum key distribution (QKD) implementations, memory effects caused by the limited bandwidth of modulators and/or other active devices can leak information about previous setting choices. Security proofs addressing this imperfection require the characterization of pulse correlations, which, in principle, can be of an arbitrary order, even unbounded. Experimentally, this is very hard (if not impossible) to achieve. Here, we solve this pressing problem by introducing a simple linear model to explain pulse correlations. In so doing, we can derive upper bounds on the correlation strength of arbitrary order from the study of the step response of the system. Importantly, this is what is needed to ensure the security of QKD in the presence of pulse correlations of unbounded length. We experimentally characterize short-range correlations and apply the proposed method to account for long-range correlations to an infinite order.
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quant-ph 5years
2026 5representative citing papers
Analytical finite-key security proof for decoy-state QKD that incorporates state-preparation flaws, bit/basis side-channel leakage and correlations, intensity fluctuations, and detection-efficiency mismatches.
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A numerical framework proves finite-key security for practical decoy-state QKD systems with transmitter and receiver imperfections including non-IID signals.
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Simplified quantum key distribution implementation secure in the presence of state preparation flaws
A three-state BB84 QKD system with time-bin encoding achieves secure key distribution over 151 km by adapting the loss-tolerant method to account for measured state preparation flaws.
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Finite-key security analysis of decoy-state QKD with source and detector imperfections
Analytical finite-key security proof for decoy-state QKD that incorporates state-preparation flaws, bit/basis side-channel leakage and correlations, intensity fluctuations, and detection-efficiency mismatches.
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Phase-correlation-free quantum key distribution source operating at gigahertz rates
A SLED-based 1.25 GHz QKD source achieves intrinsic phase randomization between pulses while maintaining >99% visibility within pulses.
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Numerical security analysis for practical quantum key distribution
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