Quantum key distribution with entangled photon sources

By Xiongfeng Ma, Chi-Hang Fred Fung, Hoi-Kwong Lo. 2007

240 citations recorded by the source corpus.

A parametric down-conversion (PDC) source can be used as either a triggered single-photon source or an entangled-photon source in quantum key distribution (QKD). The triggering PDC QKD has already been studied in the literature. On the other hand, a model and a post-processing protocol for the entanglement PDC QKD are still missing. We fill in this important gap by proposing such a model and a post-processing protocol for the entanglement PDC QKD. Although the PDC model is proposed to study the entanglement-based QKD, we emphasize that our generic model may also be useful for other non-QKD experiments involving a PDC source. Since an entangled PDC source is a basis-independent source, we apply Koashi and Preskill's security analysis to the entanglement PDC QKD. We also investigate the entanglement PDC QKD with two-way classical communications. We find that the recurrence scheme increases the key rate and the Gottesman-Lo protocol helps tolerate higher channel losses. By simulating a recent 144-km open-air PDC experiment, we compare three implementations: entanglement PDC QKD, triggering PDC QKD, and coherent-state QKD. The simulation result suggests that the entanglement PDC QKD can tolerate higher channel losses than the coherent-state QKD. The coherent-state QKD with decoy states is able tomore » achieve highest key rate in the low- and medium-loss regions. By applying the Gottesman-Lo two-way post-processing protocol, the entanglement PDC QKD can tolerate up to 70 dB combined channel losses (35 dB for each channel) provided that the PDC source is placed in between Alice and Bob. After considering statistical fluctuations, the PDC setup can tolerate up to 53 dB channel losses.« less

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

View Paper: https://www.semanticscholar.org/paper/1d3be2cce83992c617db57d784af1e3cbd9bf13a

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

1. Jian-Wei Pan
2. Xiongfeng Ma
3. Hoi-Kwong Lo
4. Lan Zhou
5. Yu‐Bo Sheng
6. Feihu Xu
7. Qiang Zhang
8. Cheng-Zhi Peng

In Atomic and Molecular Physics, and Optics

1. Jian-Wei Pan
2. Xiongfeng Ma
3. Lan Zhou
4. Yu‐Bo Sheng
5. Hoi-Kwong Lo
6. Feihu Xu
7. Qiang Zhang
8. Cheng-Zhi Peng

Citations in the corpus

• High-fidelity transmission of entanglement over a high-loss free-space channel (2009, background): “From a technological perspective, the overall two-photon loss bridged in our experiment is significantly higher than the current 40 dB limi”
• Micius quantum experiments in space (2022, background): “Entanglement-based QKD is particularly attractive because of its inherent sourceindependent security (Koashi and Preskill, 2003; Ma, Fung, and Lo, 2007), which allows security to be established without any assumption of trusted relay.”
• Practical challenges in quantum key distribution (2016, unknown): “More details on all protocols can be found in refs 6,7,38,39.”
• One-step quantum secure direct communication. (2021, methodology): “Here, we take the simple entanglement-based QKD protocol as an example [62].”
• Secure quantum key distribution with realistic devices (2020, background): “(17) We call this kind of source basis-independent (Koashi and Preskill, 2003; Ma et al., 2007).”