Multiport interferometers are an important tool in the emerging field of quantum information technologies. In theoretical work, we investigate implementing Haar-random unitary transformations in...Show moreMultiport interferometers are an important tool in the emerging field of quantum information technologies. In theoretical work, we investigate implementing Haar-random unitary transformations in increasingly large interferometers with realistic imperfections. We find that random matrices result in mostly low values of interferometer beam splitter reflectivities. We model production imperfections and we find that these severely limit the implementation of random matrices. We show the effects of the imperfection can be mitigated through optimisation of interferometer degrees of freedom and by adding additional beam splitters. In experimental work, we investigate the realisation of reconfigurable multiport interferometers in silica-on-silicon integrated photonics chips using a modular design. We show that individual modules are fully reconfigurable. We give a proof-of-principle of the design by connecting three modules for the first time and measure 5% transmission.Show less
This thesis tests the RAS model created by John Zaller. By using the Dutch Parliamentary Election Study from 1998 to 2003, the observed change in public opinion of Dutch voters towards non western...Show moreThis thesis tests the RAS model created by John Zaller. By using the Dutch Parliamentary Election Study from 1998 to 2003, the observed change in public opinion of Dutch voters towards non western immigrants is tested. Results include the inability to explain the changes in public opinion according to the RAS model. However, key variables such as political knowledge and political predispositions prove to be significant explanatory variables in this case.Show less
