In a society based on the continuous exchange of sensitive data and information, the importance of secure and trustable communications is essential. By exploiting principles of Quantum Physics, it is possible to share data in an unconditionally secure way, no longer based on mathematical assumptions of the encryption algorithm, 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.
By 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) QKD protocol (DPTS), where by combining two different degrees of freedom (time and phase) is possible to increase the performance, in terms of final secret key rate, of the actual QKD systems in a metropolitan area network scenario.
Moreover, I will present a new scheme for high-dimensional (HD) quantum communications systems based on space division multiplexing. In particular, we proved the first silicon chip-to-chip HD decoy-state QKD based on spatial degrees of freedom (the cores of a multi-core fiber).
Davide Bacco was born in Italy in 1986. He received his M.Sc degree on Telecommunication Engineering in 2011 at the University of Padova, Italy. In 2015 he accomplished the Ph.D. degree on Science Technology and Spatial Measures (CISAS) at the University of Padova. During 2015 he worked 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 of the Technical University of Denmark (DTU). His research interests regard quantum optical communications, secure communications and silicon photonics for optical communications.