Equiangular Spherical Codes in Quantum Cryptography

Abstract

Quantum key distribution protocols based on equiangular spherical codes are introduced and their behavior under the intercept/resend attack investigated. Such protocols offer a greater range of secure noise tolerance and speed options than protocols based on their cousins, the mutually-unbiased bases, while also enabling the determination of the channel noise rate without the need to sacrifice key bits. For fixed number of signal states in a given dimension, the spherical code protocols offer Alice and Bob more noise tolerance at the price of slower key generation rates.

6 pages revtex, 2 figures. Together with quant-ph/0402135, this paper subsumes quant-ph/0311106

References in corpus (1)

• Spherical Code Key Distribution Protocols for Qubits

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