Continuous entanglement distribution over a transnational 248 km fiber link

Sebastian Philipp Neumann (), Alexander Buchner, Lukas Bulla, Martin Bohmann and Rupert Ursin ()
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Sebastian Philipp Neumann: Institute for Quantum Optics and Quantum Information Vienna
Alexander Buchner: Institute for Quantum Optics and Quantum Information Vienna
Lukas Bulla: Institute for Quantum Optics and Quantum Information Vienna
Martin Bohmann: Institute for Quantum Optics and Quantum Information Vienna
Rupert Ursin: Institute for Quantum Optics and Quantum Information Vienna

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Reliable long-distance distribution of entanglement is a key technique for many quantum applications, most notably quantum key distribution. Here, we present a continuously working, trusted-node free international link between Austria and Slovakia, directly distributing polarization-entangled photon pairs via 248 km of deployed telecommunication fiber. Despite 79 dB loss, we observe stable detected pair rates of 9 s−1 over 110 h. We mitigate multi-pair detections with strict temporal filtering, enabled by nonlocal compensation of chromatic dispersion and superconducting nanowire detectors. Fully automatized active polarization stabilization keeps the entangled state’s visibility at 86% for altogether 82 h. In a quantum cryptography context, this corresponds to an asymptotic secure key rate of 1.4 bits/s and 258 kbit of total key, considering finite-key effects. Our work paves the way for low-maintenance, ultra-stable quantum communication over long distances, independent of weather conditions and time of day, thus constituting an important step towards the quantum internet.

Date: 2022
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DOI: 10.1038/s41467-022-33919-0

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