Enhanced autocompensating quantum cryptography system |
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Authors: | Bethune Donald S Navarro Martha Risk William P |
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Affiliation: | IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099, USA. bethune@almaden.ibm.com |
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Abstract: | 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. |
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