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Experimental Quantum Key Distribution with Decoy States

Open access
Zhao, Yi, Qi, Bing, Ma, Xiongfeng, Lo, Hoi-Kwong, Qian, Li·2006·Physical Review Letters

Abstract

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 165 bit/s, which is 1/4 of the theoretical limit, can be obtained over 15 km of a telecommunication 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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Metadata

Authors
Zhao, Y., Qi, B., Ma, X., Lo, H.-K., & Qian, L.
Venue
Physical Review Letters
Published
2006-02-22
Volume
96
Issue
7
Pages
070502-070502
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W2056393659
Cited by
382
References
2
FWCI
32.15
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Experimental Quantum Key Distribution with Decoy States. https://app.cochat.ai/papers/10.1103/physrevlett.96.070502
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Zhao, Y., Qi, B., Ma, X., Lo, H.-K., & Qian, L. (2006). Experimental Quantum Key Distribution with Decoy States. Physical Review Letters. https://doi.org/10.1103/physrevlett.96.070502

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