Quantum key distribution with 2-bit quantum codes

Details Quantum key distribution with 2-bit quantum codes Quantum key distribution with 2-bit quantum codes

2003-08-10

arxiv.org/abs/quant-ph/0308057v3

Physics

Quantum Physics

Approved for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.92.077902

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.

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