Security of quantum key distribution with imperfect phase randomisation
arXiv:2210.08183 · doi:10.1088/2058-9565/ad141c
Abstract
The performance of quantum key distribution (QKD) is severely limited by multiphoton emissions, due to the photon-number-splitting attack. The most efficient solution, the decoy-state method, requires that the phases of all transmitted pulses are independent and uniformly random. In practice, however, these phases are often correlated, especially in high-speed systems, which opens a security loophole. Here, we address this pressing problem by providing a security proof for decoy-state QKD with correlated phases that offers key rates close to the ideal scenario. Our work paves the way towards high-performance secure QKD with practical laser sources, and may have applications beyond QKD.
22 pages, 1 figure. v3: Updated to Accepted Manuscript
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- Quantum key distribution with imperfectly isolated devices
- Quantum key distribution with unbounded pulse correlations
- Intensity correlations in decoy-state BB84 quantum key distribution systems
- Characterising higher-order phase correlations in gain-switched laser sources with application to quantum key distribution
- A consolidated and accessible security proof for finite-size decoy-state quantum key distribution
- Loss-tolerant quantum key distribution with detection efficiency mismatch
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