Journal
PHYSICAL REVIEW A
Volume 92, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.92.032305
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Funding
- NSERC
- CRC program
- Connaught Innovation Fund
- Industry Canada
- OGS Visa Award
- Air Force Office of Scientific Research (AFOSR)
- CryptoWorks21
- U.S. Office of Naval Research
- Mike & Ophelia Lazaridis Fellowship
- National Natural Science Foundation of China [61178010, 11304391]
- China Scholarship Council [201406470051]
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Decoy-state quantum key distribution (QKD) is a standard technique in current quantum cryptographic implementations. Unfortunately, existing experiments have two important drawbacks: the state preparation is assumed to be perfect without errors and the employed security proofs do not fully consider the finite-key effects for general attacks. These two drawbacks mean that existing experiments are not guaranteed to be proven to be secure in practice. Here, we perform an experiment that shows secure QKD with imperfect state preparations over long distances and achieves rigorous finite-key security bounds for decoy-state QKD against coherent attacks in the universally composable framework. We quantify the source flaws experimentally and demonstrate a QKD implementation that is tolerant to channel loss despite the source flaws. Our implementation considers more real-world problems than most previous experiments, and our theory can be applied to general discrete-variable QKD systems. These features constitute a step towards secure QKD with imperfect devices.
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