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Now showing items 34029-34048 of 41754
Quantum information with black boxes : lifting protocols from theory to implementation
According to recent estimates, 10^18 bytes of data are generated on a daily basis around the globe. Our information society urges for radical solutions to treat such data deluge. By exploiting fundamental key elements of ...
Quantum Information with Continuous Variable systems
Aquesta tesi tracta l'estudi de protocols de comunicació quàntica amb sistemes devariable continua (CV). Els sistemes de CV són aquells descrits per coordenades canòniques conjugades $x$ i $p$ dotades amb un espai de Hilbert ...
Quantum light source compatible with solid-state quantum memories and telecom networks
This PhD thesis is in the scope of experimental quantum communication. It deals with correlated photon pairs of which one photon is stored in a solid state device, while the other photon is at telecom wavelength. Quantum ...
A quantum light-matter interface with Rydberg polaritons in a cold atomic ensemble
Nonlinear optics at the single-photon level enables deterministic photonphoton interaction, a long-standing goal in quantum photonics science. Besides its implication in fundamental aspects of physics, this would unlock ...
Quantum liquid droplets in a mixture of Bose-Einstein condensates
In this thesis, we report on the design and construction of a quantum simulator experiment using quantum gases in Spain. This experiment exploits mixtures of the three isotopes of potassium, which give access in an original ...
Quantum many-body physics with ultracold atoms and molecules: exact dynamics and machine learning
(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 ...
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 ...
