Experimental repeater-like quantum communications over 600 km of optical fibre aided by wavelength-multiplexed phase stabilization

Mirko Pittaluga; Mariella Minder; Marco Lucamarini; Mirko Sanzaro; Robert I. Woodward; Zhiliang Yuan; Andrew J. Shields

doi:10.1117/12.2607479

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9 March 2022 Experimental repeater-like quantum communications over 600 km of optical fibre aided by wavelength-multiplexed phase stabilization

Mirko Pittaluga, Mariella Minder, Marco Lucamarini, Mirko Sanzaro, Robert I. Woodward, Zhiliang Yuan, Andrew J. Shields

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Proceedings Volume PC12015, Quantum Computing, Communication, and Simulation II; PC120150W (2022) https://doi.org/10.1117/12.2607479
Event: SPIE OPTO, 2022, San Francisco, California, United States

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.

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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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