Donald S Bethune and William P Risk 2002 New J. Phys. 4 42 doi:10.1088/1367-2630/4/1/342
Autocompensating quantum cryptography
Focus on Quantum CryptographyDonald S Bethune and William P Risk
Show affiliationsPart of Focus on Quantum Cryptography
Quantum cryptographic key distribution (QKD) uses extremely faint light pulses to carry quantum information between two parties (Alice and Bob), allowing them to generate a shared, secret cryptographic key. Autocompensating QKD systems automatically and passively compensate for uncontrolled time-dependent variations of the optical fibre properties by coding the information as a differential phase between orthogonally polarized components of a light pulse sent on a round trip through the fibre, reflected at mid-course using a Faraday mirror. We have built a prototype system based on standard telecom technology that achieves a privacy-amplified bit generation rate of ~1000 bits s-1 over a 10 km optical fibre link. Quantum cryptography is an example of an application that, by using quantum states of individual particles to represent information, accomplishes a practical task that is impossible using classical means.
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Issue 1 (July 2002)
Received 28 January 2002
Published 12 July 2002
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Autocompensating quantum cryptography
Donald S Bethune and William P Risk 2002 New J. Phys. 4 42
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