Now showing items 39-58 of 242

    Device-independent certification of quantum resources 

    Supic, Ivan (Date of defense: 2018-09-19)

    The last two decades have been a very fruitful period for the fundamental research related to quantum information theory. Today we have a fairly good understanding of how intrinsically quantum properties affect various ...

    Device-independent information protocols: measuring dimensionality, randomness and nonlocality 

    Gallego López, Rodrigo (Date of defense: 2013-02-22)

    The device-independent formalism is a set of tools to analyze experimental data and infer properties about systems, while avoiding almost any assumption about the functioning of devices. It has found applications both in ...

    Diffuse optical monitoring of cerebral hemodynamics in experimental and clinical neurology 

    Blanco Núñez, Igor D. (Date of defense: 2015-01-31)

    The study of the brain using diffuse optical methods has progressed rapidly in the recent years. The possibility of studying the cerebral microvasculature in addition to the portability and low cost of these devices, opens ...

    Discerning between thermal and electronic effects in plasmonenhanced organic reactions 

    Bordacchini, Ivan (Date of defense: 2020-10-30)

    Since the pioneering work of Fujishima and Honda on titanium dioxide, TiO2, for the electrochemical photolysis of water under ultraviolet (UV) irradiation, semiconductor-based photocatalysis and photovoltaics have become ...

    Double resonant character in an optical cavity for high performance and stable polymer solar cells 

    Liu, Quan (Date of defense: 2018-03-23)

    Solution-processed thin film solar cells emerged as very promising photovoltaic technologies suitable for a low cost roll-to-roll upscale production. Such thin film character also ensures lightweight and flexibility for ...

    Dynamics of optically levitated nanoparticles in high vacuum 

    Gieseler, Jan (Date of defense: 2014-02-03)

    Nanotechnology was named one of the key enabling technologies by the European Commission and its tremendous impact was envisioned early by 20th century physicist R.Feynman in his now oft-quoted talk "Plenty of Room at the ...

    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 ...

    Dynamics of spinor fermions 

    Ebling, Ulrich (Date of defense: 2014-11-03)

    Ultracold atomic gases have established themselves as quantum systems, which are clean and offer a high degree of control over crucial parameters. They are well isolated from their environment and thus offer the possibility ...

    Eco-friendly solar cells with cation-engineered AgBiS2 nanocrystals 

    Wang, Yongjie (Date of defense: 2023-02-23)

    (English) Climate change and global energy demand urge the development of renewable energy sources for worldwide power supply. Photovoltaic devices that convert solar energy directly into electricity are the most promising, ...

    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 ...

    Elliptically polarized light for depth resolved diffuse reflectance imaging in biological tissues 

    Sridhar, Susmita (Date of defense: 2016-10-05)

    Polarization gating imaging is a popular and widely used imaging technique in biomedical optics to sense tissues, deeper volumes, and also selectively probe sub-superficial volumes. Due to the "polarization memory" effect ...

    Entanglement and Bell correlations in strongly correlated many-body quantum systems 

    Piga, Angelo (Date of defense: 2020-03-30)

    During the past two decades, thanks to the mutual fertilization of the research in quantum information and condensed matter, new approaches based on purely quantum features without any classical analog turned out to be ...

    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 ...

    Entanglement and state characterisation from two-photon interference 

    Beduini, Federica A. (Date of defense: 2015-11-3)

    This thesis analyses the effects of two-photon interference in a polarisation squeezed state under two different points of view: on one hand, it presents a new method to obtain the temporal wavefunction of a state of two ...

    Entanglement, Bell’s inequalities and coherence : new ideas and new scenarios 

    Vallés Marí, Adam (Date of defense: 2017-02-14)

    The work presented in this thesis, mostly experimental, is based on three main pillars: the concepts of entanglement, Bell's inequalities and coherence. Entanglement is a very special type of correlation that can exist ...

    Environmentally friendly nanocrystals synthesized and processed in ambient conditions for solution-processed solar cells 

    Akgul, M. Zafer (Date of defense: 2021-02-11)

    Due to the continuously increasing energy demand and the environmental concerns about climate changes raised by international community, alternative energy resources have been put under intense investigation for the past ...

    Environmentally-friendly perovskite nanocrystals based on titanium and tin 

    Liga, Shanti Maria (Date of defense: 2023-03-22)

    (English) The availability of energy is a fundamental ingredient for the development of society. However, the intense consumption of fossil fuels as an energy resource since the second industrial revolution has caused a ...

    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 ...

    Experimental evidence for the quantum condensation of ultracold dipolar excitons 

    Alloing, Mathieu (Date of defense: 2014-05-28)

    In this thesis, we report experimental evidence of a "gray" condensate of excitons, as predicted theoretically by M. Combescot et al. Most importantly, the condensate is characterized by the macroscopic population of dark ...

    Experimental tools for quantum networking operations with single photons and sinlge ions 

    Huwer, Jan Henning (Date of defense: 2014-01-29)

    One promising approach for future quantum networks is the combination of strings of trapped ions as quantum-information processors with entangled photon pairs produced by spontaneous parametric down conversion (SPDC) to ...