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9 March 2022 Experimental repeater-like quantum communications over 600 km of optical fibre aided by wavelength-multiplexed phase stabilization
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Abstract
Twin-field (TF) quantum key distribution (QKD) fundamentally alters the rate-distance relationship of QKD, offering the scaling of a single-node quantum repeater. Although recent experiments have demonstrated the new opportunities for secure long-distance communications allowed by TF-QKD, formidable challenges remain to unlock its true potential. Here, we introduce a novel wavelength-multiplexed stabilisation scheme that overcomes past limitations and can be adapted to other phase-sensitive single-photon applications. In our work, we develop a setup that provides key rates over a record fibre distance of 605 km and increases the secure key rate at long distances by two orders of magnitude to values of practical significance.
Conference Presentation
© (2022) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mirko Pittaluga, Mariella Minder, Marco Lucamarini, Mirko Sanzaro, Robert I. Woodward, Zhiliang Yuan, and Andrew J. Shields "Experimental repeater-like quantum communications over 600 km of optical fibre aided by wavelength-multiplexed phase stabilization", Proc. SPIE PC12015, Quantum Computing, Communication, and Simulation II, PC120150W (9 March 2022); https://doi.org/10.1117/12.2607479
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KEYWORDS
Quantum communications

Quantum key distribution

Optical fibers

Photons

Quantum cryptography

Internet

Optical communications

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