Decoy state quantum key distribution with a photon number resolved heralded single photon source
- 23 March 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 73 (3), 032331
- https://doi.org/10.1103/physreva.73.032331
Abstract
Recently a long distance and high key rate quantum key distribution (QKD) has become possible by the idea of the decoy state method. We show that a longer distance QKD is possible by utilizing a heralded single photon source (utilizing spontaneous parametric down-conversion) as a source instead of a weak coherent pulse (WCP) as proposed in the original decoy state method. Moreover, the key rate is improved by utilizing a presently available photon number resolving detector as a trigger detector of the heralded single photon source and it is shown to approach the key rate of the WCP.Keywords
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