Online PhD defence by Kristoffer Bitsch Joanesarson

Title: Few-photon transport in photonic devices


Principal supervisor: Prof. Jesper Mørk, DTU Fotonik, Denmark
Co-supervisor: Jacob Christian Iles-Smith
Co-supervisor: Mikkel Heuck, Massachusetts Institute of Technology, USA

Evaluation Board
Dr., Research fellow Tommaso Tufarelli, University of Nottingham, England
Assoc. Prof Nir Rotenberg, University of Copenhagen, Denmark

Assoc. Prof. Karsten Rottwitt, DTU Fotonik, Denmark

Master of the Ceremony
Senior Reseacher Radu Malureanu, DTU Fotonik, Denmark

By efficiently manipulating quantum mechanical effects, certain computational tasks that would be impossible to solve today, could be solved within a reasonable amount of time, thus potentially revolutionise today’s technology. A promising platform for realising this is using single particles of light, photons, confined to a single spatial dimension, which can be engineered in photonic devices. By deliberately embedding localised quantum impurities in the photon path, the flow of information encoded in the photons can be controlled. The topic of this thesis is analysing how these quantum impurities, e.g. artificial atoms, affect light differently, depending on the number of photons in a given pulse. We show how quantum mechanical information correlations – quantum entanglement – can be established between two different atoms, after photons have scattered off them. We also show how highly asymmetric scattering properties can be engineered, and how this can be exploited for making a tuneable few-photon switch. As a final investigation, we analyse the effects of non-perfect atoms, and quantify the degree to which this reduces nonlinear scattering properties.

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tor 23 apr 20
13:30 - 16:30


DTU Fotonik