Unconditional security of the Bennett 1992 quantum key-distribution scheme with strong reference pulse

Details Unconditional security of the Bennett 1992 quantum key-distribution scheme with strong reference pulse Unconditional security of the Bennett 1992 quantum key-distribution scheme with strong reference pulse

2006-07-13

arxiv.org/abs/quant-ph/0607082v2

Phys. Rev. A 80 032302 (2009)

Physics

Quantum Physics

More detailed presentation and a bit modified security proof

Scientific paper

We prove the unconditional security of the original Bennett 1992 protocol with strong reference pulse. We show that we may place a projection onto suitably defined qubit spaces before the receiver, which makes the analysis as simple as qubit-based protocols. Unlike the single-photon-based qubits, the qubits identified in this scheme are almost surely detected by the receiver even after a lossy channel. This leads to the key generation rate that is proportional to the channel transmission rate for proper choices of experimental parameters.

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