Enhanced Autocompensating Quantum Cryptography System

Details Enhanced Autocompensating Quantum Cryptography System Enhanced Autocompensating Quantum Cryptography System

2001-04-18

arxiv.org/abs/quant-ph/0104089v2

Applied Optics LP 41 (2002) 1640-1648

Physics

Quantum Physics

13 pages, 1 table, 9 figures; Applied Optics LP (in press, to appear 3/02)

Scientific paper

10.1364/AO.41.001640

We have improved the hardware and software of our autocompensating system for quantum key distribution by replacing bulk optical components at the end stations with fiber-optic equivalents and implementing software that synchronizes end-station activities, communicates basis choices, corrects errors and performs privacy amplification over a local area network. The all fiber-optic arrangement provides stable, efficient and high-contrast routing of the photons. The low bit error rate leads to high error correction efficiency and minimizes data sacrifice during privacy amplification. Characterization measurements made on a number of commercial avalanche photodiodes are presented that highlight the need for improved devices tailored specifically for quantum information applications. A scheme for frequency shifting the photons returning from Alice's station to allow them to be distinguished from backscattered noise photons is also described. OCIS codes: 030.5260, 060.0060, 060.2360, 230.2240, 270.5570.

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