Unconditional Security of Single-Photon Differential Phase Shift Quantum Key Distribution
Unconditional Security of Single-Photon Differential Phase Shift Quantum Key Distribution
In this Letter, we prove the unconditional security of the single-photon differential phase shift quantum key distribution (DPS-QKD) protocol, based on the conversion to an equivalent entanglement-based protocol. We estimate the upper bound of the phase error rate from the bit error rate, and show that the DPS-QKD protocol can …