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Continuous entanglement distribution over a transnational 248 km fiber link

Sebastian Philipp Neumann
(
- IQOQI, Vienna and
- Vienna U.
)
,
Alexander Buchner
(
- IQOQI, Vienna and
- Vienna U.
)
,
Lukas Bulla
(
- IQOQI, Vienna and
- Vienna U.
)
,
Martin Bohmann
(
- IQOQI, Vienna and
- Vienna U.
)
,
Rupert Ursin
(
- IQOQI, Vienna and
- Vienna U.
)

Mar 23, 2022

23 pages

Published in:

Nature Commun. 13 (2022) 1, 6134,
Nature Commun. 13 (2022) 6134

Published: Oct 17, 2022

e-Print:

2203.12417 [quant-ph]

DOI:

10.1038/s41467-022-33919-0

View in:

ADS Abstract Service

reference search67 citations

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Abstract: (Springer)

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.

Note:

23 pages, 6 figures

References(48)

Figures(0)

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