Unconditionally secure quantum key distribution over 50km of standard telecom fibre

Abstract

We demonstrate a weak pulse quantum key distribution system using the BB84 protocol which is secure against all individual attacks, including photon number splitting. By carefully controlling the weak pulse intensity we demonstrate the maximum secure bit rate as a function of the fibre length. Unconditionally secure keys can be formed for standard telecom fibres exceeding 50 km in length.

9 pages 2 figures

References in corpus (3)

• Security Aspects of Practical Quantum Cryptography
• Quantum key distribution over 122 km of standard telecom fiber
• Quantum Key Distribution over 67 km with a plug & play system

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• Performance of various quantum key distribution systems using 1.55 um up-conversion single-photon detectors
• Effect of detector dead-times on the security evaluation of differential-phase-shift quantum key distribution against sequential attacks
• One-way Quantum Key Distribution System based on Planar Lightwave Circuits