A fully automated entanglement-based quantum cryptography system for telecom fiber networks

Autor(en)

Andreas Poppe, Alexander Treiber, Michael Hentschel, Daniele Ferrini, Thomas Lorünser, Edwin Querasser, Thomas Matyus, Hannes Hübel, Anton Zeilinger

Abstrakt

We present in this paper a quantum key distribution (QKD) system based on polarization entanglement for use in telecom fibers. A QKD exchange up to 50 km was demonstrated in the laboratory with a secure key rate of 550 bits s-1. The system is compact and portable with a fully automated start-up, and stabilization modules for polarization, synchronization and photon coupling allow hands-off operation. Stable and reliable key exchange in a deployed optical fiber of 16 km length was demonstrated. In this fiber network, we achieved over 2 weeks an automatic key generation with an average key rate of 2000 bits s-1 without manual intervention. During this period, the system had an average entanglement visibility of 93%, highlighting the technical level and stability achieved for entanglement-based quantum cryptography.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Austrian Research Centers GmbH (ARC Seibersdorf), Universität Wien

Journal

New Journal of Physics

Band

11

Anzahl der Seiten

19

ISSN

1367-2630

DOI

https://doi.org/10.1088/1367-2630/11/4/045013

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

103026 Quantenoptik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/20438b2c-405d-47b6-a328-3d86985db46b