Quantum Cryptography using larger alphabets

Details Quantum Cryptography using larger alphabets Quantum Cryptography using larger alphabets

1999-10-22

arxiv.org/abs/quant-ph/9910095v1

Physics

Quantum Physics

12 pages, 2 (eps) figures

Scientific paper

10.1103/PhysRevA.61.062308

Like all of quantum information theory, quantum cryptography is traditionally based on two level quantum systems. In this letter, a new protocol for quantum key distribution based on higher dimensional systems is presented. An experimental realization using an interferometric setup is also proposed. Analyzing this protocol from the practical side, one finds an increased key creation rate while keeping the initial laser pulse rate constant. Analyzing it for the case of intercept/resend eavesdropping strategy, an increased error rate is found compared to two dimensional systems, hence an advantage for the legitimate users to detect an eavesdropper.

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