Scientific article
Open access

Quantum repeaters with entangled coherent states

Published inJournal of the Optical Society of America. B, Optical physics, vol. 27, no. 6, p. A137-A145
Publication date2010

We perform quantum key distribution (QKD) over a single fibre in the presence of four classical channels in a C-band dense wavelength division multiplexing (DWDM) configuration using a commercial QKD system. The classical channels are used for key distillation and 1 Gbps encrypted communication, rendering the entire system independent of any other communication channel than a single dedicated fibre. We successfully distil secret keys over fibre spans of up to 50 km. The separation between the quantum channel at 1551.72 nm and the nearest classical channel is only 200 GHz, while the classical channels are all separated by 100 GHz. In addition to that, we discuss possible improvements and alternative configurations, e.g. whether it is advantageous to choose the quantum channel at 1310 nm or to opt for a pure C-band (1530–1565 nm) configuration.

Citation (ISO format)
SANGOUARD, Nicolas et al. Quantum repeaters with entangled coherent states. In: Journal of the Optical Society of America. B, Optical physics, 2010, vol. 27, n° 6, p. A137–A145. doi: 10.1364/JOSAB.27.00A137
Main files (1)
Article (Accepted version)
ISSN of the journal0740-3224

Technical informations

Creation08/23/2010 11:15:00 AM
First validation08/23/2010 11:15:00 AM
Update time03/14/2023 4:06:16 PM
Status update03/14/2023 4:06:16 PM
Last indexation01/15/2024 9:36:40 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack