Experimental Quantum Key Distribution with Decoy States

Details Experimental Quantum Key Distribution with Decoy States Experimental Quantum Key Distribution with Decoy States

2005-03-24

arxiv.org/abs/quant-ph/0503192v4

Physical Review Letters 96, 070502 (2006).

Physics

Quantum Physics

Revised Version, 4 pages, one figures, two-column format

Scientific paper

10.1103/PhysRevLett.96.070502

To increase dramatically the distance and the secure key generation rate of quantum key distribution (QKD), the idea of quantum decoys--signals of different intensities--has recently been proposed. Here, we present the first experimental implementation of decoy state QKD. By making simple modifications to a commercial quantum key distribution system, we show that a secure key generation rate of 165bit/s, which is 1/4 of the theoretical limit, can be obtained over 15km of a Telecom fiber. We also show that with the same experimental parameters, not even a single bit of secure key can be extracted with a non-decoy-state protocol. Compared to building single photon sources, decoy state QKD is a much simpler method for increasing the distance and key generation rate of unconditionally secure QKD.

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