Programa de Doctorat en Fotònica: Recent submissions
Now showing items 41-60 of 268
Toward integrating continuous-variable quantum key distribution technology
(English) Being able to secure confidential information is imperative in today’s society, but advancements in quantum technologies pose a potential threat. In response, researchers are developing technologies based on ...
Demonstration of new experimental schemes for imaging and sensing: from quantum to classical and back
(English) This Ph.D. thesis presents research in imaging and optical sensing, exploring novel concepts, and diverse applications. The experimental schemes put forward here are based on simulating specific aspects of quantum ...
Exploring quantum memory schemes in cold atoms for quantum repeaters
(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 ...
Molecular and cellular aspects of proprioceptive control in C. elegans
(English) Locomotion behavior is the output of the integrated clues by the nervous system along with proprioceptive regulation, which encompasses responses such as avoiding, feeding, and reproduction. Mechanosensation, the ...
Light absorption and ergodicity in systems that transform light into other forms of energy
(English) To mitigate the present environmental crisis, caused by the excessive use of fossil fuels and associated release of carbon dioxide into the atmosphere, it is necessary to significantly reduce worldwide energy ...
Preclinical and clinical studies in oncology and endocrinology with diffuse light
(English) Near-infrared diffuse optical spectroscopy (DOS) techniques are capable of non-invasive measurement of microvascular hemodynamic parameters of deep tissues (>1 cm penetration). One important focus of the field ...
Highly percolated ultra-thin metal films for reconfigurable metasurfaces
(English) There is currently significant scientific and technological interest in ultrathin materials, with at least one dimension in the nm range or even smaller, since they possess features not achievable with their ...
Single-atom motional dynamics in an optical dipole trap
(English) This thesis studies, using simulation and experiment, the motional dynamics of a single atom in an optical dipole trap. The optical dipole trap we study is a single-beam, red-detuned, far-off-resonance trap (FORT). ...
Generation of macroscopic spin singlets in cold atomic ensembles
(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 ...
Light-matter interaction with atomic ensembles
(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 ...
Optical parameter sensing: sensitivity limits and the advantages of using spatial modes of light
(English) Resolution enhancement in modern optical metrology techniques has been possible due to significant technological improvements. The accurate and precise control of wavelength, bandwidth, and power of light sources; ...
Optical holographic microscopy for bio- and nanoparticle characterization
(English) Nowadays, being able to precisely characterize nanoparticles is of key relevance in a wide range of scenarios. For instance, chemical and pharmaceutical industries often rely in particle-sizing for quality control. ...
Advanced single molecule fluorescent tools to reveal spatiotemporal multi-molecular interactions in living cells
(English) The spatiotemporal organisation and compartmentalisation of molecules in living cells is crucial to regulate cell function. Dysregulation in how molecules dynamically explore their environment and interact with ...
Nanophotonics with charged particles
(English) Among the fundamental constituents of matter, charged particles such electrons and positrons are leading protagonists in physical phenomena associated with small (~ meV) and high (~ MeV) energy scales. For example, ...
Solution-processed quantum dot infrared lasers
(English) Colloidal semiconductors quantum dots (CQDs) have emerged as a promising solutionprocessed gain material that can be engineered via low-cost and scalable chemical techniques. Owing to quantum confinement, their ...
Attosecond soft X-ray absorption revealing the ultrafast non-adiabatic dynamics of furan
(English) One of the fundamental goals of the physical chemistry community has always been to be able to follow the details of the evolution of chemical reactions in real-time. Besides the extreme temporal resolution ...
Eco-friendly solar cells with cation-engineered AgBiS2 nanocrystals
(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, ...
Environmentally-friendly perovskite nanocrystals based on titanium and tin
(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 ...
Fluorescence quantum yield and the open circuit voltage in perovskite solar cells
(English) To mitigate the energy and climate crisis we are already facing and address the increasing energy consumption, it is essential to foster energy transition strategies. The energy transition success largely depends ...
Towards efficient quantum repeater nodes based on solid-state quantum memories
(English) Quantum repeaters are the foundation of future long-distance quantum networks. In most architectures, their functional core is constituted by quantum memories, which are devices that can store and re-emit photonic ...
