Multi-user quantum key distribution with a semiconductor source of entangled photon pairs (Conference Presentation)

Sara Ducci; Claire Autebert; Julien Trapateau; Adeline Orieux; Aristide Lemaître; Carmen Gomez Carbonell; Eleni Diamanti; Isabelle Zaquine

doi:10.1117/12.2255093

28 April 2017 Multi-user quantum key distribution with a semiconductor source of entangled photon pairs (Conference Presentation)

Sara Ducci, Claire Autebert, Julien Trapateau, Adeline Orieux, Aristide Lemaître, Carmen Gomez Carbonell, Eleni Diamanti, Isabelle Zaquine

Author Affiliations +

Proceedings Volume 10111, Quantum Sensing and Nano Electronics and Photonics XIV; 101112J (2017) https://doi.org/10.1117/12.2255093
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

In view of real world applications of quantum information technologies, the combination of miniature quantum resources with existing fibre networks is a crucial issue. Among such resources, on-chip entangled photon sources play a central role for applications spanning quantum communications, computing and metrology. Here, we use a semiconductor source of entangled photons operating at room temperature in conjunction with standard telecom components to demonstrate multi-user quantum key distribution, a core protocol for securing communications in quantum networks. The source consists of an AlGaAs chip emitting polarization entangled photon pairs over a large bandwidth in the main telecom band around 1550 nm without the use of any off-chip compensation or interferometric scheme; the photon pairs are directly launched into a dense wavelength division multiplexer (DWDM) and secret keys are distributed between several pairs of users communicating through different channels. We achieve a visibility measured after the DWDM of 87% and show long-distance key distribution using a 50-km standard telecom fibre link between two network users. These results illustrate a promising route to practical, resource-efficient implementations adapted to quantum network infrastructures.

Conference Presentation

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Sara Ducci, Claire Autebert, Julien Trapateau, Adeline Orieux, Aristide Lemaître, Carmen Gomez Carbonell, Eleni Diamanti, and Isabelle Zaquine "Multi-user quantum key distribution with a semiconductor source of entangled photon pairs (Conference Presentation)", Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101112J (28 April 2017); https://doi.org/10.1117/12.2255093

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