Now showing items 1-20 of 241

    Toward integrating continuous-variable quantum key distribution technology 

    Aldama Guardia, Jennifer Diana (Date of defense: 2023-12-20)

    (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 

    Urrego González, Daniel Fernando (Date of defense: 2023-11-14)

    (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 

    Heller, Lukas (Date of defense: 2023-11-06)

    (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 

    Malaiwong, Nawaphat (Date of defense: 2023-10-24)

    (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 

    Ferreira, Catarina Gonçalves (Date of defense: 2023-09-27)

    (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 

    Fernández Esteberena, Pablo Ricardo (Date of defense: 2023-09-27)

    (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 

    Martínez Cercós, Daniel (Date of defense: 2023-06-21)

    (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 

    Alves, Natália Domingues (Date of defense: 2023-06-16)

    (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 

    Behbood, Naeimeh (Date of defense: 2015-04-17)

    (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 

    Dubost, Brice (Date of defense: 2012-11-26)

    (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 

    Villegas Juárez, Arturo (Date of defense: 2023-04-26)

    (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 

    Ortiz de Orruño Cuesta, Unai (Date of defense: 2023-04-21)

    (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 

    Mateos Estévez, Nicolás (Date of defense: 2023-04-28)

    (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 

    Giulio, Valerio di (Date of defense: 2023-04-12)

    (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 

    Taghipour, Nima (Date of defense: 2023-03-21)

    (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 

    Severino, Stefano (Date of defense: 2023-03-13)

    (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 

    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, ...

    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 ...

    Fluorescence quantum yield and the open circuit voltage in perovskite solar cells 

    Kramarenko, Mariia (Date of defense: 2023-03-24)

    (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 ...

    Multiple light scattering in atomic media : from metasurfaces to the ultimate refractive index 

    Andreoli, Francesco (Date of defense: 2023-03-23)

    (English) Our ability to confine, guide, and bend light has led to astonishing technological achievements, playing a fundamental role in diverse fields like microscopy, photochemistry, telecommunications or material design. ...