I did my master final project at the research group Coherence Quantum Technology (CQT). Here, I did a detailed analysis of the entanglement and polarization of the two photons emitted via nonlinear double-Compton scattering, by working within strong-field QED. I found that entangled photon pairs can be created for moderate electron-laser beam parameters. These entangled photons can be separated from the unentangled background contribution by spectral filtering. I showed that there is a high correlation between the photon pair polarization and entanglement thereof, opening up new possible experiments and allowing for an accessible source of entangled X-rays. Ref. http://arxiv.org/abs/2311.17807 (preprint)

I did my internship at the Interface Analysis group of the Max-Planck-Institute for solid state research. At this group I worked on the electronic and structural properties of terbium intercalated graphene on SiC. I prepared graphene on SiC samples by doing epitaxial growth of graphene on a SiC substrate. This growth process is done by annealing the SiC samples in argon atmosphere causing the silicon to sublimate and form a (buffer)-layer of graphene on the SiC. Thereafter, the terbium intercalation is achieved by depositing terbium on top of the graphene/SiC sample (regulated by a quarts micro-balance) and then annealing the sample, causing the terbium to go underneath the graphene, therefore creating a graphene/terbium/SiC heterostructure. Because of the electropositive nature of the terbium, the graphene shows Van Hove Singularity doping. To characterize the samples I made use of the following experimental techniques: angle resolved photoemission spectroscopy (ARPES), low-energy electron diffraction (LEED), X-Ray photoemission spectroscopy (XPS) and atomic force microscopy (AFM).

I helped tutoring the base physics course, which mainly involves explaining basic physical concepts.

Coherence Quantum Technology (CQT) is a research group specializing in fundamental, but applied quantum physics and coherence research. In this group I helped with the Coldlight project. This project has as goal to use inverse Compton scattering for the X-ray diffraction imaging of matter. Because coherence and polarization is of importance in this process I developed a theory to describe and predict the coherence and polarization of the x-ray source. Or more precisely: I developed a covarient formulation for the polarization and coherence for ICS (Inverse Compton Scattering). Ref. B. H. Schaap, T.D.C. de Vos, P.W. Smorenburg and O. J. Luiten, New J. Phys. 24, 033040 (2022).

I worked at Emerson during the summer holidays for personal development and work experience, for a period of five years. During this period I worked for facilities, IT, Engineering, Marketing and Sales. I made administrative contributions for facilities and IT. For example, I helped for making the new Sharepoint website for facilities and made sure all laptops were registered for IT. For marketing I mainly made sure their website was up-to-date and the storage for the marketing tools was sufficient. For the engineering department I checked the loop sheets (Hardware), and I did Process Assessment and reporting.