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Now showing items 34099-34118 of 41831
Quantum many-particle electron transport in time-dependent systems with Bohmian trajectories
Es conocido que a escalas nanométricas se debe tratar con en el problema de muchas partículas a la hora de estudiar dispositivos electrónicos. Es estos escenarios, la ecuación de Schrödinger dependiente del tiempo para ...
Quantum measurements with cold atomic ensembles
This thesis describes quantum measurements of an ensemble of cold rubidium-87 atoms. We extend the covariance matrix formalism to spin-1 systems, including effects of decoherence, losses due to probing and atom number ...
Quantum Mechanics/Molecular Mechanics modeling of biological relevant reactions catalyzed by enzymes
A theoretical study of the hydrolysis of a β-lactam antibiotic was carried out in gas phase at different levels of theory. Later, the reaction was studied in solution, describing the sub-set of atoms of the QM region with ...
Quantum memory protocols for photonic solid-state devices
A photonic quantum memory (QM) is a device that has the capability of storing a quantum state of light and retrieving back after a controlled time. It is an important element in quantum information science and is, among ...
Quantum metrology and thermometry in open systems
En mi tesis exploro la metrología cuántica en sistemas abiertos, con especial enfoque en la estimaci ón de temperatura cuántica o termometría. Para este objetivo, voy a clasificar mi estudio en dos regímenes diferentes ...
Quantum metrology with high-density atomic vapors and squeezed states of light
Nowadays there is a considerable progress in optical magnetometry and spin noise spectroscopy, which use magnetically-sensitive atomic ensembles and optical read-out, approaching the limits set by quantum mechanics. In ...
Quantum Monte Carlo study of few-and many-body bose systems in one and two dimensions
In this Thesis, we report a detailed study of the ground-state properties of a set of quantum few- and many-body systems by using Quantum Monte Carlo methods. First, we introduced the Variational Monte Carlo and Diffusion ...
Quantum multipartite entangled states, classical and quantum error correction
Studying entanglement is essential for our understanding of such diverse areas as high-energy physics, condensed matter physics, and quantum optics. Moreover, entanglement allows us to surpass classical physics and ...
Quantum nonlinear optics at the single-photon level with cold Rydberg atoms
Photons are good candidates for carrying quantum information because they are very stable particles: they interact weakly with the medium and barely with each other. However, this has drawbacks when you want to process ...
Quantum Optics at its best: from quantum interferometry to quantum metrology
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 ...
Quantum random number generators for industrial applications
Randomness is one of the most intriguing, inspiring and debated topics in the history of the world. It appears every time we wonder about our existence, about the way we are, e.g. Do we have free will? Is evolution a result ...
“Quantum Satis”: Una Propuesta Conceptual y Operativa Para Educar en el Consumo Sostenible. Teoría y práctica a partir de un estudio de caso
Situando la educación para el consumo sostenible en el nexo entre la educación para la paz y la educación para el desarrollo sostenible, esta tesis realiza una aproximación contextualizada al concepto de “Quantum Satis” y ...
Quantum simulations with ultracold atoms: beyond standard optical lattices
Many outstanding problems in quantum physics, such as high-Tc superconductivity or quark confinement, are still - after decades of research - awaiting commonly accepted explanations. One reason is that such systems are ...
Quantum transport in Solid state devices for Terahertz frequency applications
El treball presentat en aquesta tesi es dedica a la comprensió de desafiaments pràctics i conceptuals en la simulació de propietats dinàmiques més enllà de l’aproximació quasi-estàtica en dispositius quàntics d’estat sòlid ...
Quantum transport with Bohmian mechanics: application to graphene devices
La ley de Moore ha sido una piedra fundamental en la mejora de la electónica y la causa del aumento de nuestra capacidad computacional y de la existencia de la electónica. En estas dimensiones, herramientas de simulación ...
Quantum-based spectroscopy and efficient energy transport with biomolecules
For many years, the fields of quantum optics and biology have rarely shared a common path. In quantum optics, most of the concepts and techniques developed over the years stand for systems where only a few degrees of freedom ...
Quantum-enhanced imaging with SPAD array cameras
(English) Entangled photon pairs can enhance optical imaging capabilities. Phase imaging allows detecting fine detail of transparent samples without potentially invasive fluorescent labelling, and here entanglement enables ...
Quasi One Dimensional Antimony Selenide Thin Film Solar Cells for Next Generation Photovoltaics
This PhD thesis explores the quasi one dimensional Sb2Se3 absorber material and its application in substrate thin film solar cells in a SLG/Mo/Sb2Se3/CdS/i-ZnO/ITO configuration. The body of the thesis is introduced by a ...
Quasi-Dynamic Characterization of Hybrid Photovoltaic/Thermal (PV/T) Flat-Plate Collectors
Un model híbrid transitòria fotovoltaic / tèrmic ha estat desenvolupat i validat experimentalment. La metodologia s'estén el model tèrmic quasi-dinàmica s'indica a la norma EN 12975 per involucrar el rendiment elèctric i ...
