Closing the gap of secure quantum key rate with the Heralded Pair-Coherent States

Details Closing the gap of secure quantum key rate with the Heralded Pair-Coherent States Closing the gap of secure quantum key rate with the Heralded Pair-Coherent States

2008-07-11

arxiv.org/abs/0807.1760v1

Physics

Quantum Physics

Scientific paper

In this paper, we investigate the long-standing gap of quantum key rate between the Weak Coherent Pulse (WCP) and Heralded Single Photon Sources(HSPS) implementation of quantum cryptographical protocol. We prove that, by utilizing the Heralded Pair Coherent State (HPCS) photon sources, such a gap can be actually filled in both BB84 and SARG quantum key distribution. Thus, a universal photon source which achieves the up-to-date optimal key rate for each transmission distance is obtained.

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