Unconditionally secure quantum key distribution with relatively strong signal pulse

2007/11/22 by Kiyoshi Tamaki · 12 citations
Computer Science · Mathematics · Physics and Astronomy · #Algorithm #Computer science #Computer security #Cryptography #Detector #Key (lock) #Key generation #Mathematics #Physics #Protocol (science) #Pulse (music) #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum key distribution #Quantum mechanics #Quantum optics and atomic interactions #SIGNAL (programming language) #Telecommunications #Topology (electrical circuits) #quant-ph

paper · pdf · doi:10.1103/physreva.77.032341

published in Physical Review A 77(3) (American Physical Society) · 4 pages

arxiv created 2007/11/22 · openalex publication_date 2008/03/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/08

Abstract

We propose an unconditionally secure quantum key distribution protocol, which uses a relatively strong signal pulse. While our protocol shares similar security bases as the Bennett 1992 protocol with a strong reference pulse, our scheme uses a smaller number of detectors and it is robust against Rayleigh scattering in an optical fiber. We derive a lower bound of secret key generation rate of our protocol and show that our protocol can cover relatively long distances, assuming precise phase modulations and stable interferometers.

Citations

• Beating the Photon-Number-Splitting Attack in Practical Quantum Cryptography
• Unconditional Security of Coherent-State Quantum Key Distribution with a Strong Phase-Reference Pulse
• Quantum cryptography using any two nonorthogonal states
• Decoy State Quantum Key Distribution
• Quantum key distribution over 122 km of standard telecom fiber
• Quantum Key Distribution with High Loss: Toward Global Secure Communication