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

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

2004-12-22

arxiv.org/abs/quant-ph/0412173v1

Electronics Letters 40, 1603-1605(2004)

Physics

Quantum Physics

9 pages 2 figures

Scientific paper

10.1049/el:20045038

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.

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