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Quantum Information and Measurement (QIM)

All-optical synchronization for quantum networking

Bruno Fedrici, Lutfi Arif Ngah, Olivier Alibart, Florian Kaiser, Laurent Labonté, Virginia D’Auria, Sébastien Tanzilli

Published Jan 1, 2017• 1 citation
Publisher

Abstract

We report an original all-optical synchronization scheme suitable for a quantum relay based experiments at telecom wavelengths. Our scheme is validated by a two-photon interference visibility greater than 99% at the relay station.
DOI
10.1364/qim.2017.qf3b.5

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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2017•1 citation
We report an all-optical realisation of a quantum relay experiment at a telecom wavelength. The main idea relies on utilizing a picosecond 2.5 GHz repetition rate telecom laser as a master clock to allow, thanks to dedicated distribution channels, the generation of synchronized entangled pairs of photons at remote locations. This is a necessary condition for achieving a reliable quantum relay function over a significant distance. We report a two-photon interference visibility at the relay station greater than 99%, validating our synchronization scheme at optical table scale, and paving the way for an extend of the communication distance.
We present an all-optical method for synchronizing remote quantum network stations dedicated to the generation or the storage of photonic entanglement. We apply our method to the connection of two sources emitting pairs of photons at telecom wavelengths. Our experimental setup is based on a pulsed telecom fiber laser operating at 2.5 GHz that pumps, after frequency doubling, two nonlinear waveguide photon-pair sources. Our synchronization scheme is validated via the implementation of a two-photon interference experiment performed at the relay station, i.e. where the Bell state measurement takes place. We show a raw visibility greater than 90%, obtained in the 4-fold coincidence counts, for a separation distance of 100 km between the photon- pair sources. This result demonstrates the relevance of our approach.
Summary form only given. Entanglement based quantum communications and quantum networks are considered as fundamental resources to address the demand of secure communications. In this context, the architecture known as quantum relay plays a crucial role as it allows linking together independent communication channels each spanned by a pair of entangled photons. In particular, this scheme is particularly interesting for long instance applications where the bad effect of propagation losses and detection imperfections can be reduced by dividing a long link into shorter subsections and connecting then via entanglement teleportation [1].In conclusion, our scheme offers a valid and extremely simple solution to the source synchronization issues affecting the quantum relay schemes. Eventually, we note that the proposed configuration completely relies on off-the-shelf telecom and non-linear components, that can be easily interfaced to existing telecom fibre networks.