Measurement-Device-Independent Quantum Key Distribution Over a 404 km Optical Fiber.

By Hua‐Lei Yin, Teng-Yun Chen, Zong-Wen Yu, Hui Liu, Lixing You, Yiheng Zhou, Sijing Chen, Yingqiu Mao, Ming-Qi Huang, Wei-Jun Zhang and 9 more. Physical Review Letters, 2016

653 citations recorded by the source corpus.

Measurement-device-independent quantum key distribution (MDIQKD) with the decoy-state method negates security threats of both the imperfect single-photon source and detection losses. Lengthening the distance and improving the key rate of quantum key distribution (QKD) are vital issues in practical applications of QKD. Herein, we report the results of MDIQKD over 404 km of ultralow-loss optical fiber and 311 km of a standard optical fiber while employing an optimized four-intensity decoy-state method. This record-breaking implementation of the MDIQKD method not only provides a new distance record for both MDIQKD and all types of QKD systems but also, more significantly, achieves a distance that the traditional Bennett-Brassard 1984 QKD would not be able to achieve with the same detection devices even with ideal single-photon sources. This work represents a significant step toward proving and developing feasible long-distance QKD.

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

View Paper: https://www.semanticscholar.org/paper/b566b204dc69dd349dcfe3fda90ec15bdb7f2b8b

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Citations in the corpus

Twin-field quantum key distribution over 830-km fibre (2019, methodology): “Furthermore, measurement-deviceindependent (MDI) QKD [20] has been performed over 404 km ultralow-loss fibre in laboratory [9], which is immune to any attack on detection by exploiting the twophoton Bell state measurement (BSM).”
Superconducting nanowire single-photon detectors for quantum information (2020, neutral): “2  10 bps MDI [165] Ultralow-loss fiber”
Overcoming the rate–distance limit of quantum key distribution without quantum repeaters (2018, background): “16 bit/hour over 404 km of ultralowloss fibre in a measurement-device-independent configuration.(4) Increasing the bit rate and range of QKD is a formidable, but important, challenge.”
Advances in quantum cryptography (2019, neutral): “The distance of MDI-QKD was then boosted to 200 km [237] and 404 km [238] using ultra-low loss fiber with an attenuation of 0.”