Experimental demonstration of long-distance continuous-variable quantum key distribution

By Paul Jouguet, Sébastien Kunz-Jacques, Anthony Leverrier, Philippe Grangier, Eleni Diamanti. Nature Photonics, 2012

771 citations recorded by the source corpus.

Distributing secret keys with information-theoretic security is arguably one of the most important achievements of the field of quantum information processing and communications1. The rapid progress in this field has enabled quantum key distribution in real-world conditions2,3 and commercial devices are now readily available. Quantum key distribution systems based on continuous variables4 provide the major advantage that they only require standard telecommunication technology. However, to date, these systems have been considered unsuitable for long-distance communication5,6,7. Here, we overcome all previous limitations and demonstrate for the first time continuous-variable quantum key distribution over 80 km of optical fibre. All aspects of a practical scenario are considered, including the use of finite-size data blocks for secret information computation and key distillation. Our results correspond to an implementation guaranteeing the strongest level of security for quantum key distribution reported so far for such long distances and pave the way to practical applications of secure quantum communications. Researchers demonstrate continuous-variable quantum key distribution over 80 km of optical fibre. They develop a detection system based on homodyne detectors to achieve an unprecedented level of stability and implement new codes tailored to perform secure communication optimally in a range of signal-to-noise ratios corresponding to long distances.

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

View Paper: https://www.semanticscholar.org/paper/e97755b56bd738bb5f294f8fa926c599d9e72471

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Citations in the corpus

Long-distance continuous-variable quantum key distribution by controlling excess noise (2016, methodology): “Because of the difficulty of reconciliation at low signal-to-noise ratios (SNRs) in previous 25 km experiments 15–19 , P. Jouguet et al. developed an efficient error-correcting code (ECC) 20 which leads to a remarkable improvement of transmission distance for CV-QKD 21 .”
Self-referenced continuous-variable quantum key distribution protocol (2015, methodology): “However, with the recent development of higher efﬁciency error correction codes [10–12] and more comprehensive security proofs [13–15] for CV-QKD, it is becoming an attractive alternative to DV-QKD.”
Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations (2017, background): “mprehensive theoretical overview of CV-QKD (including squeezed-state protocols) is provided in [13]. By now, many experimental demonstrations underlined the feasibility of CV-QKD with coherent states [14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]. The experimental performance of these works has to”
High-rate measurement-device-independent quantum cryptography (2013, methodology): “[27].”
Practical challenges in quantum key distribution (2016, positive): “38,42 We remark that advances towards high-performance QKD systems in terms of key rate and distance are coupled with the security guarantees offered by these systems.”
Secure quantum key distribution with realistic devices (2020, background): “…et al., 2013) Source Phase randomization Experiment 2012 Memory attacks (Barrett et al., 2013) Detection Classical memory Theory 2013 Local oscillator (Jouguet et al., 2013a; Ma et al., 2013b)∗∗ Detection Local oscillator Experiment 2013 Trojan horse (Jain et al., 2014, 2015) Source&Detection…”
A Survey on Quantum Channel Capacities (2018, background): “Optical fiber based [240], [252], [279], [497] ground-ground [549] and ground-space [297] systems have already been demonstrated.”
Secure quantum key distribution (2014, background): “Another interesting option is to use continuous-variable systems (CV-QKD) [46–48].”
Advances in quantum cryptography (2019, positive): “Specifically, the scheme based on Gaussian modulation of coherent states and homodyne detection has matured over the last 15 years from a simple laboratory demonstration based on bulk optical components creating keys with very low bandwidth [455–458] to a robust telecombased system that generates ke”
Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations (2015, methodology): “[64]: Coherent states, homodyne detection, collective attacks with some finite−size effects Ref.”