Effect of detector dead times on the security evaluation of differential-phase-shift quantum key distribution against sequential attacks

2008/03/10 by Marcos Curty, Kiyoshi Tamaki, Tobias Moroder
Computer Science · Physics and Astronomy · #Algorithm #Coherent states #Computer science #Computer security #Dead time #Detector #Differential (mechanical device) #Differential phase #Key (lock) #Phase (matter) #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum key distribution #Quantum mechanics #Quantum optics and atomic interactions #SIGNAL (programming language) #State (computer science) #Telecommunications #quant-ph

paper · pdf · doi:10.1103/physreva.77.052321

published as Phys. Rev. A 77, 052321 (2008) · 21 pages, 14 figures

arxiv created 2008/03/10 · openalex publication_date 2008/05/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We investigate limitations imposed by detector dead times on the performance of sequential attacks against a differential-phase-shift (DPS) quantum key distribution (QKD) protocol with weak coherent pulses. In particular, we analyze sequential attacks based on unambiguous state discrimination of the signal states emitted by the source and we obtain ultimate upper bounds on the maximal distance achievable by a DPS QKD scheme both for the case of calibrated and uncalibrated devices, respectively.

Citations

• Security of differential-phase-shift quantum key distribution against individual attacks
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• Qubit Entanglement Breaking Channels
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• Sequential attack with intensity modulation on the differential-phase-shift quantum-key-distribution protocol
• General Entanglement Breaking Channels