Prof. Eleni DIAMANTI

Prof.  Eleni DIAMANTI

Eleni Diamanti is a CNRS research director at the LIP6 laboratory of Sorbonne University in Paris. She received her Diploma in Electrical and Computer Engineering from the National Technical University of Athens in 2000 and her PhD in Electrical Engineering from Stanford University in 2006. She then worked as a Marie Curie postdoctoral researcher at the Institute of Optics Graduate School in Palaiseau before joining the CNRS in 2009. Her research focuses on experimental quantum cryptography and communication complexity, and on the development of photonic resources for quantum networks. She is a recipient of a European Research Council Starting Grant, vice director of the Paris Centre for Quantum Computing, steering committee member of the French regional and national networks on Quantum Technologies, and elected member of the Board of Stakeholders of the European Public Private Partnership in Photonics.

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Secure communication in quantum networks

In these lectures, we will start with a description of basic protocols used in quantum communications and quantum cryptography, with an emphasis on quantum teleportation and quantum key distribution. For the latter, we will discuss notions of security and focus on photonic implementations, using encoding in discrete or continuous variables of light, enabling key distribution with security guarantees impossible to achieve with only classical resources. We will also describe current challenges in the field and efforts towards the miniaturization of the developed photonic systems, their integration into telecommunication network infrastructures, including with satellite links, as well as the practical demonstration of novel protocols featuring a quantum advantage for a wide range of advanced cryptographic tasks, such as coin flipping, quantum money, or entanglement verification. We will show in particular examples illustrating how it is possible to transpose an abstract theoretical protocol designed for ideal devices to the realm of a practical, inevitably faulty system, which is nevertheless capable of providing rigorous security guarantees. Such advances enrich the resources and applications of the emerging quantum networks that will play a central role in the context of future quantum-safe communications.