Implementation of quantum cryptographic protocols using practical photonic systems

25 09/2013

Wednesday, 25 Sep. 2013, 11:00 - 12:30

Workgroup Walther Group

Presenter: Dr. Eleni Diamanti
Host: P. Walther
Where: Josef-Stefan-Hörsaal, 3rd floor, Boltzmanngasse 5 - 1090 Vienna

In future quantum information networks, individual parties will have the ability to communicate in a variety of ways with trusted and untrusted parties using resources ranging from purely classical devices to full-scale quantum computers. In this context, several cryptographic protocols, inherently linked to fundamental features of quantum mechanics, become essential. In this talk, we are interested in protocols that are at the heart of many advanced secure communication and computation tasks, namely key distribution, coin flipping and entangled state verification. In particular, we examine the implementation of these protocols using photonic systems, which provide an ideal physical support for quantum communications. We discuss how imperfections and limitations of practical systems affect the security of the protocols and how implementations offering high performance and strong security guarantees - superior to what classical communication alone could ever provide - are nevertheless achieved. These results, together with perspectives for novel integrated photonic components and tests of compatibility with current network infrastructure, offer a powerful toolbox or practical applications of secure quantum communications.