Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre

Autor(en)

Sören Wengerowsky, Siddarth Koduru Joshi, Fabian Steinlechner, Julien R. Zichi, Bo Liu, Thomas Scheidl, Sergiy M. Dobrovolskiy, René van der Molen, Johannes W. N. Los, Val Zwiller, Marijn A. M. Versteegh, Alberto Mura, Davide Calonico, Massimo Inguscio, Anton Zeilinger, André Xuereb, Rupert Ursin

Abstrakt

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% $\pm$ 2% and was stable over several hours. We employed neither active stabilisation of the quantum state nor chromatic dispersion compensation for the fibre.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW), University of Bristol, Fraunhofer-Institut für Angewandte Optik und Feinmechanik, Friedrich-Schiller-Universität Jena, KTH - Royal Institute of Technology, Single Quantum, National University of Defense Technology (NUDT), Istituto Nazionale di Ricerca Metrologica, European Laboratory for Non-Linear Spectroscopy (LENS), Università Campus Bio-Medico di Roma, Consiglio Nazionale delle Ricerche, University of Malta, Vienna Center for Quantum Science and Technology (VCQ), Technische Universität Wien

Journal

npj Quantum Information

Band

6

Anzahl der Seiten

5

ISSN

2056-6387

DOI

https://doi.org/10.1038/s41534-019-0238-8

Publikationsdatum

2020

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik, 103026 Quantenoptik

Schlagwörter

ASJC Scopus Sachgebiete

Computer Science (miscellaneous), Statistical and Nonlinear Physics, Computer Networks and Communications, Computational Theory and Mathematics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/c2ec5693-094f-4543-abfd-91a1421e1412