We propose an efficient phase-encoding quantum secret key generation scheme with heralded narrow-band single photons.The key information is carried by the phase modulation directly on the single-photon temporal waveform.We show that when the technique is applied to the conventional single photon phase-encoding BB84 and differential phase shift(DPS)quantum key distribution schemes,the key generation efficiencies can be improved by factors of 2 and 3,respectively.For N(≥3)−period DPS systems,the key generation efficiency can be improved by a factor of N.The technique is suitable for quantum-memory-based long-distance fiber communication systems.
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