Quantum key distribution without detector vulnerabilities using optically seeded lasers
Quantum cryptography without detector vulnerabilities using optically-seeded lasers
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Comandar, L., Lucamarini, M., Fröhlich, B., Dynes, J., Sharpe, A., Tam, S., Yuan, Z., et al. (2016). Quantum key distribution without detector vulnerabilities using optically seeded lasers. Nature Photonics, 10 (5), 312-315. https://doi.org/10.1038/nphoton.2016.50
© 2016 Macmillan Publishers Limited. All rights reserved. Security in quantum cryptography is continuously challenged by inventive attacks targeting the real components of a cryptographic set-up, and duly restored by new countermeasures to foil them. Owing to their high sensitivity and complex design, detectors are the most frequently attacked components. It was recently shown that two-photon interference from independent light sources can be used to remove any vulnerability from detectors. This new form of detection-safe quantum key distribution (QKD), termed measurement-device-independent (MDI), has been experimentally demonstrated but with modest key rates. Here, we introduce a new pulsed laser seeding technique to obtain high-visibility interference from gain-switched lasers and thereby perform MDI-QKD with unprecedented key rates in excess of 1 megabit per second in the finite-size regime. This represents a two to six orders of magnitude improvement over existing implementations and supports the new scheme as a practical resource for secure quantum communications.
External DOI: https://doi.org/10.1038/nphoton.2016.50
This record's URL: https://www.repository.cam.ac.uk/handle/1810/254100