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Security of quantum key distribution with source and detector imperfections through phase-error estimation
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Security of quantum key distribution with source and detector imperfections through phase-error estimation
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Quantum key distribution (QKD) promises information-theoretic security based on quantum mechanics, but practical implementations face security vulnerabilities due to device imperfections. Recent advances have separately addressed source and detector imperfections in phase-error-estimation based security proof frameworks, but this is not enough to protect real-world QKD systems suffering from both types of imperfections simultaneously. In this work, we show that existing techniques for BB84-type protocols can be combined to construct a unified security proof that simultaneously accounts for both source and detector imperfections. Our approach thus represents a significant step towards closing the gap between theoretical security proofs and practical QKD implementations.
Forward citations
Cited by 4 Pith papers
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Security of decoy-state quantum key distribution with correlated bit-and-basis encoders
A finite-key security proof for decoy-state BB84 against coherent attacks that incorporates correlations from Alice's encoder with only partial characterization.
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Rigorous Security Proofs for Practical Quantum Key Distribution
Rigorous security proofs for variable-length QKD, phase-error bounding with imperfect detectors, marginal-constrained entropy accumulation, and authentication reductions place practical QKD on firmer mathematical ground.
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Experimental quantum cryptography with single photons and imperfect devices
A 20-minute BB84 run with a quantum-dot single-photon source yields ≈2.2×10^6 finite-size secure bits under a security proof that explicitly includes beamsplitter, detector-efficiency, dark-count, and multiphoton unce...
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Numerical security analysis for practical quantum key distribution
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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