PhD defence by Beatrice Da Lio

Title: High-dimensional and multiplexed schemes for fiber-based quantum key distribution protocols


Principal supervisor: Professor Karsten Rottwitt, DTU Fotonik
Co-supervisor: Assist. Prof. Davide Bacco, DTU Fotonik
Co-supervisor: Senior Researcher Yunhong Ding, DTU Fotonik

Evaluation Board
Assoc. Professor Darko Zibar, DTU Fotonik
Professor Gustavo Moreira Lima, Departamento de Fisica, Universidad de Concepciton, Chile
Research Director Eleni Diamanti, LIP6, CNRS, Sorbonne University, France

Master of the Ceremony
Assoc. Prof. Michael Galili, DTU Fotonik

uantum key distribution protocols are easily the most advanced quantum information technology up to date, driving the whole field of quantum communications towards actual systems implementations and flourishing theoretical advances and experimental demonstrations.

Exploiting the consolidated telecommunications industry knowledge, optimized equipment and already existing broad infrastructure, fiber-based quantum key distribution schemes are in particular a promising direction in which the scientific research efforts are addressed, for the final goal of building a quantum network.

However, three main challenges are still preventing the large-scale industrial deployment of fiber-based quantum key distribution schemes: the limited achievable secret key generation rate, when compared to those reached by classical communications; the bounded propagation distances, due to intrinsic channel losses; and the struggle of the integration with classical data rates, which are additional sources of noise from the point of view of a quantum channel.

During my Ph.D., we have focused on two of these problems, proposing new efficient designs for fiber-based high-dimensional protocols and space division multiplexing schemes to increase the secret key rate of quantum systems, and investigating the optimization of wavelength multiplexing setups for the integration with classical communications.

Register to join
Please send an email to Lisbeth Kirk Mynster to join the defence.




fre 09 okt 20
13:30 - 16:30


DTU Fotonik



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DEADLINE: 8 October 2020