Characterisation of state-preparation uncertainty in quantum key distribution
arXiv:2205.11870 · doi:10.1103/PhysRevApplied.19.014048
Abstract
To achieve secure quantum key distribution, all imperfections in the source unit must be incorporated in a security proof and measured in the lab. Here we perform a proof-of-principle demonstration of the experimental techniques for characterising the source phase and intensity fluctuation in commercial quantum key distribution systems. When we apply the measured phase fluctuation intervals to the security proof that takes into account fluctuations in the state preparation, it predicts a key distribution distance of over 100 km of fiber. The measured intensity fluctuation intervals are however so large that the proof predicts zero key, indicating a source improvement may be needed. Our characterisation methods pave the way for a future certification standard.
14 pages, 12 figures
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- Preparing a commercial quantum key distribution system for certification against implementation loopholes
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- Security of the decoy-state BB84 protocol with imperfect state preparation
- Security framework for quantum key distribution with imperfect sources
- Intensity correlations in decoy-state BB84 quantum key distribution systems
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- Quantum key distribution overcoming practical correlated intensity fluctuations
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