Towards silicon photonics for quantum communication

16.03.2017, 16:30 – 17:30

2017/03/16 16:30-17:30

Speaker: Davide Bacco | Location: Schlossgartenstraße 7 (S2|15), Handbibliothek IAP, Room 134, Darmstadt

Organizer: CROSSING


In a society based on the continuous exchange of sensitive data and information, the importance of secure and trustable information is essential. By exploiting principles Quantum Physics, it is possible to share data in an unconditionally secure way, no longer based on mathematical assumptions, but founded on the basic principles of Quantum Mechanics. In this context, our project relies on the development of a Quantum key Distribution (QKD) system able to increase the actual performance in terms of rate, security, distance and thus setting new records for quantum communications.

The key to exceed the barriers of present QKD resides in the extensive knowledge of high-speed classical optical communications merged with future technologies based on integrated photonic circuits. Using custom silicon chips combined with nonlinear devices and high-speed optical communication it will be possible to push the limits of QKD, paving the way for new horizons.

In this lecture I will present a new type of differential phase reference (DPR) quantum key distribution protocol (DPTS), where by combining two different degrees of freedom (time and phase) is possible to increase the performance, in terms of secret key rate, of the actual QKD systems [1]. Moreover, I will present a new scheme for high-dimensional quantum communications systems, based on space division multiplexing. In particular, by using different cores of a multi-core fiber is possible to create superposition of multi-dimensional quantum states [2].


1. Bacco D. et al., Two-dimensional distributed-phase-reference protocol for quantum key distribution, Scientific Reports 6:36756 (2016)

2. Ding, Y. et al., High-Dimensional Quantum Key Distribution based on Multicore Fiber using Silicon Photonic Integrated Circuits, arXiv:1610.01812 (2016)

Short Bio

Davide Bacco was born in Italy in 1986.He received his degree on Telecommunication Engineering in 2011 at the University of Padova, Italy. He worked in 2015 as a postdoctoral fellow at the Institute for Photonic and Nanotechnology of the National Research Center (CNR-IFN), Padova.

Now he is currently a MSCA H.C. Ørsted COFUND Postdoc at the Department of Photonics Engineering at the Technical University of Denmark (DTU). His research interests regards quantum optical communications, secure communications and silicon photonics for optical communications.