A versatile system for the study of light-matter interactions at the level of individual particles 

    Bianchet, Lorena Cecilia (Date of defense: 2022-02-25)

    In this thesis, a single-atom trap in a "Maltese cross'' geometry (MCG) was designed, built up and characterized. A MCG atom trap uses four in-vacuum lenses to achieve four-directional high-numerical-aperture optical ...

    Atomic imaging of complex molecular 

    Liu, Xinyao (Date of defense: 2022-07-27)

    One of the significant challenges of modern science is to track and image chemical reactions as they occur. The molecular movies, the precise spatiotemporal tracking of changes in their molecular dynamics, will provide a ...

    A cold-atom approach to topological quantum matter across the energy scale 

    González Cuadra, Daniel (Date of defense: 2020-12-11)

    The outstanding progress achieved in the last decades to isolate and manipulate individual quantum systems has revolutionized the way in which quantum many-body phenomena, appearing across Nature's different energy scales, ...

    Controlling interactions in quantum materials : from a microscopic description to quantum simulation 

    Julià Farré, Sergi (Date of defense: 2022-06-28)

    The last decades have witnessed impressive technical advances in all the fields of quantum science, including solid-state systems or atomic, molecular, and optical physics, allowing one to control materials at the microscopic ...

    Deterministic control of nanoantenna and single-photon emitter interaction at the nanoscale 

    Palombo Blascetta, Nicola (Date of defense: 2021-03-24)

    The study of light-matter interaction at the nanoscale is a very promising field of research, providing the possibility to manipulate the interaction with single quantum systems like single atoms, molecules, atomic defects ...

    Dynamics of quantum mixtures 

    Guenther, Nils Eric (Date of defense: 2021-09-08)

    At sufficiently low temperatures, fluids of bosonic particles may undergo a phase transition, below which a Bose-Einstein condensate (BEC) forms. The BEC is one of the most fundamental concepts in many-body quantum physics ...

    Electron re-collision dynamics in strong mid-IR fields for diffraction imaging of molecular structure and its fragmentation 

    Wolter, Benjamin (Date of defense: 2018-02-26)

    One of the grand challenges of modern science is to image chemical reactions and biological functions while they are taking place. To realize these molecular movie, experimental techniques need to resolve the relevant ...

    Entanglement and non local correlations: quantum resources for information processing 

    Prettico, Giuseppe (Date of defense: 2013-01-18)

    Quantum Information Theory (QIT) studies how information can be processed and transmitted when encoded on quantum states. Practically, it can be understood as the effort to generalize Classical Information Theory to the ...

    Exact diagonalization studies of quantum simulators 

    Raventós Ribera, David (Date of defense: 2019-04-15)

    Understand and tame complex quantum mechanical systems to build quantum technologies is one of the most important scientific endeavour nowadays. In this effort, Atomic, molecular and Optical systems have clearly played a ...

    Exploring intersubbands in 2D materials 

    Schmidt, Peter, 1989- (Date of defense: 2019-04-16)

    Transition metal dichalcogenides (TMDs) are semiconducting layered materials that can be isolated up to the limit of a single atomic layer. Next to graphene, they are some of the most intensively studied materials within ...

    Exploring quantum many-body systems from an entanglement and nonlocality perspective 

    Aloy López, Albert (Date of defense: 2020-07-16)

    Entanglement and non-local correlations give rise to unprecedented phenomena with no classical analogue. As a result, they have settled themselves as fundamental properties in the study of quantum many-body systems, as ...

    Exploring quantum memory schemes in cold atoms for quantum repeaters 

    Heller, Lukas (Date of defense: 2023-11-06)

    (English) Quantum memories are devices that are able to store photonic quantum states and entanglement. Future quantum networks, which could enhance cybersecurity through quantum key distribution, improve the precision in ...

    Generation of macroscopic spin singlets in cold atomic ensembles 

    Behbood, Naeimeh (Date of defense: 2015-04-17)

    (English) This thesis describes the generation of macroscopic spin singlets in a cold atomic ensemble by performing quantum non-demolition measurement. Toward this goal we have implemented a realtime shot-nose limited ...

    Graphene mechanical resonators coupled to superconducting microwave cavities 

    Weber, Peter (Date of defense: 2016-12-02)

    In recent years, mechanical resonators based on graphene have attracted considerable interest as nanoelectromechanical systems (NEMS). Graphene NEMSs allow for exceptional properties such as high mechanical strength, high ...

    Inhomogeneity and disorder in ultrafast phase transitions 

    Pérez Salinas, Daniel (Date of defense: 2022-01-31)

    In the recent decades, there has been a surge of interest in the wide array of emergent phenomena found in strongly correlated materials. Understanding the inner workings of this type of systems is a major challenge due ...

    The insulator-metal phase transition in VO2 measured at nanometer length scales and femtosecond time scales 

    Vidas, Luciana (Date of defense: 2019-05-02)

    The physics of transition-metal oxides presents a challenge to our current understanding of condensed matter physics. The main difficulty arises from a competition between electron-electron and electron-phonon interactions ...

    Investigations of topological phases for quasi-1D systems 

    Tirrito, Emanuele (Date of defense: 2020-07-13)

    For a long time, quantum states of matter have been successfully characterized by the Ginzburg-Landau formalism that was able to classify all different types of phase transitions. This view changed with the discovery of ...

    Light-matter interaction with atomic ensembles 

    Dubost, Brice (Date of defense: 2012-11-26)

    (English) The study of quantum light-matter interaction with atomic ensembles is an active research area. This kind of system allows fundamental studies on measurement in the context of continuous variables, in collective ...

    Local temperature and correlations in quantum many-body systems 

    Hernández Santana, Senaida (Date of defense: 2019-04-12)

    Quantum Mechanics was established as the theory of the microscopic world, which allowed to understand processes in atoms and molecules. Its emergence led to a new scientific paradigm that quickly spread to different research ...

    Machine learning for quantum physics and quantum physics for machine learning 

    Huembeli, Patrick (Date of defense: 2021-03-25)

    Research at the intersection of machine learning (ML) and quantum physics is a recent growing field due to the enormous expectations and the success of both fields. ML is arguably one of the most promising technologies ...