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We propose a practical decoy state method with heralded single photon sourcefor quantum key distribution (QKD). In the protocol, 3 intensities are used andone can estimate the fraction of single-photon counts. The final key rate overtransmission distance is simulated under various parameter sets. Due to thelower dark count than that of a coherent state, it is shown that a 3-intensitydecoy-state QKD with a heralded source can work for a longer distance than thatof a coherent state.Comment: 10 pages, 4 Postscript figure

Practical decoy-state method in quantum key distribution with a heralded single-photon source