Titel
Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre
Autor*in
Siddarth Koduru Joshi
Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol
Fabian Steinlechner
Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena
... show all
Abstract
Quantum key distribution (QKD) based on entangled photon pairs holds the potential for repeater-based quantum networks connecting clients over long distance. We demonstrate long-distance entanglement distribution by means of polarisation-entangled photon pairs through two successive deployed 96 km-long telecommunications fibres in the same submarine cable. One photon of each pair was detected directly after the source, while the other travelled the fibre cable in both directions for a total distance of 192 km and attenuation of 48 dB. The observed two-photon Bell state exhibited a fidelity 85 ± 2% and was stable over several hours. We employed neither active stabilisation of the quantum state nor chromatic dispersion compensation for the fibre.
Stichwort
Quantum informationSingle photons and quantum effects
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
npj Quantum Information
Band
6
ISSN
2056-6387
Erscheinungsdatum
2020
Publication
Springer Science and Business Media LLC
Erscheinungsdatum
2020
Zugänglichkeit
Rechte
Rechteangabe
© The Author(s) 2020
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