Experimental quantum key distribution with decoy states.

By Yi Zhao, Bing Qi, Xiongfeng Ma, Hoi-Kwong Lo, Li Qian. Physical Review Letters, 2005

318 citations recorded by the source corpus.

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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/678744aa5c59f4372f28079ba7915a426c548699

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Citations in the corpus

Time-shift attack in practical quantum cryptosystems (2005, background): “Recently, decoy state QKD [13–20] has also been proposed to substantially increase the distance and key generation rate of a practical QKD system when weak coherent-state sources are used.”
Experimental demonstration of polarization encoding measurement-device-independent quantum key distribution. (2013, background): “Furthermore, as shown in [7–9], decoy state techniques can dramatically increase the key rate in practical applications [10].”
Field test of quantum key distribution in the Tokyo QKD Network. (2011, methodology): “The decoy method [19–21] was realized with three kinds of pulses: signal, decoy, and vacuum [21,28,29].”
Quantum key distribution with entangled photon sources (2007, methodology): “The experimental demonstrations for decoy state method have been done recently [29, 30, 31, 32, 33, 34].”
Advances in quantum cryptography (2019, unknown): “[211] Y.”
Differential phase shift quantum key distribution experiment over 105 km fibre (2005, background): “protocol with Poissonian sources can be significantly extended by implementing decoy states [12]‐[ 16 ].”
The security of practical quantum key distribution (2008, methodology): “As we mentioned, several experiments have already been performed (Ma et al., 2006; Peng et al., 2007; Rosenberg et al., 2007; Yuan, Sharpe and Shields, 2007; Zhao et al., 2006), more recently even including finitekey effects (Hasegawa et al., 2007).”