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Quantum Cryptography Security

Security of quantum key distribution with imperfect phase randomisation

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Authors: Guillermo Currás-Lorenzo, Shlok Nahar, Norbert Lütkenhaus, Kiyoshi Tamaki, Marcos Curty

Year

2023

Paper ID

13802

Status

Peer-reviewed

Abstract Read

~2 min

Abstract Words

101

Citations

24

Abstract

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.

Why This Paper Matters

  • This paper contributes to the Quantum Cryptography & Security research area in the Quantum Articles archive.
  • It adds a 2023 reference point for readers tracking recent quantum research.
  • Abstract The performance of quantum key distribution (QKD) is severely limited by multiphoton emissions, due to the photon-number-splitting attack.

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References & Citation Signals

[1] DOI https://doi.org/10.1088/2058-9565/ad141c [2] Publisher https://doi.org/10.1088/2058-9565/ad141c

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Current Paper #13802

External citation index: OpenAlex citation signal • updated 2026-06-14 07:14:16

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