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