Quantum key distribution using multilevel encoding: security analysis
Journal of Physics A Mathematical and General 35(47): 10065-10076
Article 2002 English
Authors
MB
Mohamed Bourennane
AK
Anders Karlsson
GR
Gunnar Bj rk
Abstract
1 min read
We propose an extension of quantum key distribution based on encoding the key into quNits, i.e. quantum states in an N-dimensional Hilbert space. We estimate both the mutual information between the legitimate parties and the eavesdropper, and the error rate, as a function of the dimension of the Hilbert space. We derive the information gained by an eavesdropper using optimal incoherent attacks and an upper bound on the legitimate party error rate that ensures unconditional security when the eavesdropper uses finite coherent eavesdropping attacks. We also consider realistic systems where we assume that the detector dark count probability is not negligible.
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