Promotor: Prof.dr. C.W.J. Beenakker

A Josephson junction is a device where a thin insulating barrier or a nanostructure is placed between two superconducting leads. Such a junction is essential to superconducting qubits that store quantum information due to its anharmonic spectrum.

Make more fluid: In condensed matter systems, electrons can acquire unusual properties from their interaction with the atomic lattice.

In unconventional high temperature superconductors, supercurrent vortices are known to spoil the Landau levels. In this thesis the emergence of Landau levels is studied in different types of superconductors: Weyl superconductors, and the Fu-Kane heterostructure.

In de geest van ‘eenheid door verscheidenheid’ is ons doel het bevorderen van inzicht in en waardering voor het wonder dat dezelfde natuurkundige wetten en wiskundige concepten van toepassing zijn op de hele natuur, van de grootste tot de kleinste energie- en lengteschalen. Wij streven naar de toepassing…

Multi-objective evolutionary computation aims to find high quality (Pareto optimal) solutions that represent the trade-off between multiple objectives.

Quantum computing is an emerging technology, which holds the potential to simulate complex quantum systems beyond the reach of classical numerical methods.Despite recent formidable advancements in quantum hardware, constructing a quantum computer capable of performing useful calculations remains challenging.In…

This thesis provides an overview of the development of the Pair Configuration to Molecular Activity Coefficient (PAC-MAC) model.

My PhD research is devoted to studies of the conjectural cluster-algebraic symmetry in the theory of topological string, which is the simplest, however already non-trivial sector in the theory of string.

This thesis covers several aspects of quantum algorithms for near-term quantum computers and its applications to quantum chemistry and material science.

Promotors: Prof.dr. J. Zaanen, Prof.dr.ir. H. Hilgenkamp

This thesis covers various applications of topology in condensed matter physics and quantum information.

The thesis deals with the study of giant radio galaxies (GRGs), which are radio galaxies of megaparsec sizes.

Op verzoek van het parlement schreef Freya Baetens een expert case study over het EU-Canada vrijhandelsverdrag (CETA) en het EU-Indonesië vrijhandelsverdrag (CEPA-Indonesia). Deze factsheet biedt parlementariërs heldere, op onderzoek gebaseerde inzichten over complexe beleidsvraagstukken en helpen bij…

In this dissertation (titled: Exploring the Synergies between Transfer in Reinforcement Learning and Procedural Content Generation) we explore how the two research fields named in the title, namely Transfer in Reinforcement Learning (TRL) and Procedural Content Generation (PCG) can synergize togethe…

Waarom bestudeerden negentiende-eeuwse geleerden Oudengelse religieuze teksten? Dit onderzoek laat zien hoe geloof, naast politiek en literatuur, hun interesse stuurde en hoe deze teksten het christelijke denken beïnvloedden in Europa.

Statistische modellen doen betere voorspellingen over toekomstig gedrag dan psychologen die gedrag louter verklaren. Daarom moeten psychologen zich meer richten op de ontwikkeling van accurate statistische voorspellingsmodellen. Dat stelt Mark de Rooij, hoogleraar Methodologie en Statistiek van Psychologisch…

De Leidse hoogleraar astronomie Mike Garrett zoekt naar tekenen van buitenaardse intelligentie. In zijn Kaiser Lentelezing op 23 april zet hij uiteen hoe ver de wetenschap op dit punt is.

Uncertainty and noise are frequently-encountered obstacles in real-world applications of numerical optimization. The practice of optimization that deals with uncertainties and noise is commonly referred to as robust optimization.

We are living in an information era where the amount of image and video data increases exponentially.

Automated Machine Learning (AutoML) is widely used to automatically build a suitable practical Machine Learning (ML) model for an arbitrary real-world problem, reducing the effort of practitioners in the ML development cycle for real-world applications. Optimization is a key part of a typical AutoML…

Promotor: M.T.M. Koper, Co-Promotor: L.B.F. Juurlink

In this thesis, topics relating to the optimization of high-throughput pipelines used for imaging are discussed. In particular, different levels of implementation, i.e., conceptual, software, and hardware, are discussed and the thesis outlines how advances on each level need to be made to make gains…

Despite being the second largest transmembrane protein family after GPCRs, the SLC superfamily has only gained significant attention in early drug development over the past decade.

Digitale editie van de correspondentie tussen de filosoof Gerardus Johannes Petrus Josephus (Gerard) Bolland (1854-1922) en de filoloog Pieter Jacob Cosijn (1840-1899), bestaande uit 46 brieven over de periode 1879 tot 1899.

Promotor: C. W. J. Beenakker, Yu. V. Nazarov, Co-promotor: J. Tworzydlo

Promotor: K.E. Schalm, Co-promotor: S.S. Lee

Het doel van het onderzoek Samen stap voor stap vooruit is om bij te dragen aan kennis over effectieve interventiemogelijkheden voor gezinnen met zeer jonge kinderen (0-6 jaar) na ervaringen van huiselijk geweld. Het onderzoek bestaat uit drie verschillende deelstudies:

Promotor: Prof.dr. C.W.J. Beenakker

This thesis is a collection of theoretical works aiming at adjusting quantum algorithms to the hardware of quantum computers.

Understanding interactions in quantum many-body systems remains one of the most profound and difficult challenges in condensed matter physics.

With the help of quantum mechanics, digital quantum hardware may be able to tackle some of the problems that are too difficult for ordinary computers. But despite these expectations and the ongoing effort of the research community, reliable quantum computers are not yet realized in a lab setting.

Waar gaan de quantummechanica, de relativiteitstheorie en de zwaartekracht elkaar vinden? Wat is het missende stukje? Of is er een compleet nieuwe theorie die alle vormen van materie elegant beschrijft?

Promotor: Prof.dr. C.W.J. Beenakker

Protein–protein complexes are formed via transient states called encounter complexes that greatly influence the formation of the stereospecific complex.

Majorana fermions in superconductors are the subgap quasiparticle excitations that are their own antiparticles.

In some condensed matter systems, such as the surface of a 3D topological insulator, the electrons are effectively massless and we must necessarily use the massless Dirac equation to describe them.

This thesis describes how to scale down concepts of macroscopic mechanical metamaterials to the thermal scale using a system of flexibly-linked colloids.

Wat is effectief kijkgedrag voor taalleerders en hoe kunnen leerkrachten taalleerders effectief trainen om effectieve kijkstrategieën toe te passen die hun leerproces maximaliseren bij het bekijken van ondertiteld materiaal?

In meta-analysis, heterogeneity often exists between studies. In such cases, it is essential to investigate the sources of heterogeneity and understand the relationship between effect size and study characteristics (i.e., moderators).

This thesis revolves around the electronic spectroscopy of molecules in the laboratory and the search for the carriers of the diffuse interstellar bands (DIBs).

Even though more than 4000 extra-solar planets are known today, only a small fraction of these has been captured in an image. To better understand the planet formation mechanisms in solar-like environments we started the Young Suns Exoplanet Survey (YSES).

One of the key discoveries in exoplanet research over the past decade is the abundance of small planets in our Milky Way. Despite their high numbers, our understanding of their atmospheres remains limited, and it is unknown if they possess atmospheres at all.

Supervisor: S.F. Portegies Zwart Co-Supervisor: A.G.A. Brown

Promotor: Prof.dr. W.T.F. den Hollander

This thesis involves three topics: benchmarking discrete optimization algorithms, empirical analyses of evolutionary computation, and automatic algorithm configuration.

Enkele keren per jaar organiseert het Europa Instituut een ‘Meet the Author’ bijeenkomst. In het kader van deze nieuwe lezingenreeks komen externe academici naar Leiden om te spreken over een recente publicatie. ‘Meet the Author’ bijeenkomsten vangen aan met een gesprek tussen een lid van het Europa…

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The high velocity tail of the total velocity distribution of stars provides essential insight into fundamental properties of the Galaxy.