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This document reports on a groundbreaking experimental demonstration of single-photon quantum key distribution (QKD) that surpasses the fundamental secure key rate limit imposed by weak coherent light. Utilizing a bright single-photon source with high efficiency, the study achieved a secure key rate of 1.08 × 10−3 bits per pulse over a free-space urban channel, exceeding the rate of traditional weak coherent pulse-based QKD by 79%. The findings highlight the potential of single-photon sources for advancing

Author

slawomir.skruszewicz

Language

EN