Quantum key distribution using nonclassical photon-number correlations in macroscopic light pulses

摘要: We propose a scheme for quantum key distribution using macroscopic nonclassical pulses of light having the order 10 6 photons per pulse. Sub-shot-noise correlation between two polarization modes in pulse gives necessary sensitivity to eavesdropping that ensures security protocol. consider two-mode squeezed generated by type-II seeded parametric amplification process. analyze system terms effect an eavesdropper on bit error rates legitimate parties system. also effects imperfect detectors and lossy channels scheme.