Now showing items 1-20 of 217

    Investigating quantum many-body systems with tensor networks, machine learning and quantum computers 

    Kottmann, Korbinian Gebhard (Date of defense: 2022-10-14)

    (English) We perform quantum simulation on classical and quantum computers and set up a machine learning framework in which we can map out phase diagrams of known and unknown quantum many-body systems in an unsupervised ...

    Contributions to nanophotonics: linear, nonlinear and quantum phenomena 

    Roque Fernández, Pablo Manuel de (Date of defense: 2022-10-18)

    (English) Nanophotonics can be defined as the science and technology studying the control optical fields at the nanoscale and their interaction with matter. In order to spatially control such fields we would need structures ...

    Resource theories of quantum dynamics 

    Hsieh, Chung Yun (Date of defense: 2022-10-10)

    (English) As one of our most successful theories, quantum theory has greatly strengthened our understanding of nature and significantly advanced technologies. Specifically, quantum effects provide advantages in a broad ...

    Squeezed-ligh-enhanced magnetometry in a high density atomic vapor 

    Troullinou, Charikleia (Date of defense: 2022-09-29)

    (English) This thesis describes experiments that employ squeezed light to improve the performance of a sensitive optically-pumped magnetometer (OPM). The squeezed light source employs parametric amplification of vacuum ...

    Quantum many-body physics with ultracold atoms and molecules: exact dynamics and machine learning 

    Dawid Lekowska, Anna Maria (Date of defense: 2022-09-20)

    (English) Quantum many-body physics poses a substantial computational challenge resulting from the exponential growth of the wave function complexity and many non-trivial correlations encoded in it. Studying many-body ...

    Synthetic quantum matter using atoms and light 

    Argüello-Luengo, Javier (Date of defense: 2022-10-21)

    Atomic and optical physics are two fields closely connected by a shared range of energy scales, and the interactions between them. Atoms represent the most fundamental components of matter, and interactions with electromagnetic ...

    Laser-induced electron interferences from atoms and molecules 

    Sánchez, Aurelien (Date of defense: 2022-07-25)

    Since discovering wave-particle duality, science has changed our perception of light and matter, especially at the subatomic level. Thanks to such discoveries, we have been able to develop and expand our scientific knowledge ...

    Development of novel multimodal light-sheet fluorescence microscopes for in-vivo imaging of vertebrate organisms 

    Bernardello, Matteo (Date of defense: 2022-06-14)

    The observation of biological processes in their native environments is of critical importance for life science. While substantial information can be derived from the examination of in-vitro biological samples, in-vivo ...

    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 ...

    Quantum Optics at its best: from quantum interferometry to quantum metrology 

    Almeida, Jessica Oliveira de (Date of defense: 2022-07-28)

    Quantum optics experiments are currently the most advanced techniques to under- stand, verify and simulate quantum phenomena. However, to access all the perfor- mance available in quantum states of light, one needs to ...

    Detection of particles, bacteria and viruses using consumer optoelectronic components 

    Hussain, Rubaiya (Date of defense: 2022-07-01)

    The focus of this thesis is on the design, development and validation of two novel photonic sensors for the detection and characterisation of industrial and biological samples. The first one is a PSA in a collimated beam ...

    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 ...

    Detection of a single erbium ion in a nanoparticle 

    Deshmukh, Chetan (Date of defense: 2022-04-29)

    Encoding information into quantum mechanical properties of a system can lead to applications many fields, including computing and communication. Devices that will enable these applications could be part of a quantum network ...

    High-peak-power mid-infrared OPCPAs for extreme nonlinear photonics 

    Elu Etxano, Ugaitz (Date of defense: 2022-05-03)

    In the last decades, intense carrier-envelope-phase-stable (CEP-stable) and near-single-cycle, coherent mid-infrared sources have become charming for a variety of applications in physics, chemistry and biology. In particular, ...

    Mechanisms and functions of the nucleus as a mechano-controller of cell contractility and migration plasticity 

    Venturini, Valeria (Date of defense: 2022-04-08)

    Living tissues are crowded and dynamic environments, in which signalling molecules and physical forces constantly act on single cells. To ensure correct tissue development and homeostasis, cells function like small processors: ...

    Simulating a topological gauge theory in a Raman-dressed Bose-Einstein condensate 

    Frölian, Anika (Date of defense: 2022-04-24)

    Ultracold quantum gases constitute a powerful and versatile tool to experimentally explore quantum many-body physics. This thesis presents an original contribution to the quantum simulation of gauge theories with ultracold ...

    Further into the infrared with quantum dot photodetectors 

    Özdemir, Onur (Date of defense: 2022-02-04)

    In the infrared, photodetectors are the key components in a wide-variety of applications such as thermal imaging, remote sensing, spectroscopy with newer technologies added to the list such as LiDaR and deep tissue imaging. ...

    Spatiotemporal organisation of protein nanoclusters in adhesion complexes 

    Keary, Sarah (Date of defense: 2022-02-28)

    The main goal of this thesis was to contribute to the understanding of the nanoscale lateral organisation of key proteins in adhesion complexes. For this, we exploited single molecule localisation-based super-resolution ...

    Photodetectors based on graphene pn-junctions for mid-infrared and terahertz range 

    Castilla, Sebastián (Date of defense: 2022-01-27)

    Long wavelength light contains the infrared and terahertz (THz) spetral range of the spectrum. This wavelength range spans approximately from 1 µm to 1 mm. Several applications can be explored in this spectral range such ...

    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 ...