Quantum key distribution with 2-bit quantum codes
Quantum Physics
2009-11-10 v3
Abstract
We propose a prepare-and-measure scheme for quantum key distribution with 2-bit quantum codes. The protocol is unconditionally secure under whatever type of intercept-and-resend attack. Given the symmetric and independent errors to the transmitted qubits, our scheme can tolerate a bit error rate up to 26% in 4-state protocol and 30% in 6-state protocol, respectively. These values are higher than all currently known threshold values for prepare-and-measure protocols. A specific realization with linear optics is given.
Cite
@article{arxiv.quant-ph/0308057,
title = {Quantum key distribution with 2-bit quantum codes},
author = {Xiang-Bin Wang},
journal= {arXiv preprint arXiv:quant-ph/0308057},
year = {2009}
}
Comments
Approved for publication in Physical Review Letters