Now showing items 52-71 of 242

    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 ...

    Exploring flatland nano-optics with graphene plasmons 

    Woessner, Achim (Date of defense: 2017-05-11)

    Plasmons are charge oscillations coupled to electromagnetic radiation. One of their most intriguing properties is their deep subwavelength confinement resulting in strongly enhanced light-matter interaction. Metal plasmons ...

    Exploring intersubbands in 2D materials 

    Schmidt, Peter, 1989- (Date of defense: 2019-04-16)

    Transition metal dichalcogenides (TMDs) are semiconducting layered materials that can be isolated up to the limit of a single atomic layer. Next to graphene, they are some of the most intensively studied materials within ...

    Exploring quantum many-body systems from an entanglement and nonlocality perspective 

    Aloy López, Albert (Date of defense: 2020-07-16)

    Entanglement and non-local correlations give rise to unprecedented phenomena with no classical analogue. As a result, they have settled themselves as fundamental properties in the study of quantum many-body systems, as ...

    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 ...

    Exploring twisted bilayer graphene with nano-optics 

    Hesp, Niels Caspar Herman (Date of defense: 2021-10-20)

    Nano-optics studies the behaviour of light on the nanoscale. In particular, it probes the interaction of light with objects, often of nanometre-size, and reveals fine details of the material's optical properties. Optoelectronics ...

    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 ...

    From cells to tissues, microscopy to modeling: towards precise, data-driven photothermal therapy with gold nanorods 

    Morales Dalmau, Jordi (Date of defense: 2019-02-15)

    Suspensions of gold nanorods (GNRs) are emerging as potential drugs to address some of the limitations in traditional biomedical sensing,imaging and therapy. They are inorganic nanoparticles with good biocompatibility, ...

    From quantum foundations to quantum information protocols and back 

    Torre Carazo, Gonzalo de la (Date of defense: 2015-09-23)

    Physics has two main ambitions: to predict and to understand. Indeed, physics aims for the prediction of all natural phenomena. Prediction entails modeling the correlation between an action, the input, and what is subsequently ...

    Further into the infrared with quantum dot photodetectors 

    Özdemir, Onur (Date of defense: 2022-02-04)

    In the infrared, photodetectors are the key components in a wide-variety of applications such as thermal imaging, remote sensing, spectroscopy with newer technologies added to the list such as LiDaR and deep tissue imaging. ...

    Generation of intense few-cycle phase-stable electric fields: from the mid-IR to soft X-rays 

    Silva, Francisco José Maia da (Date of defense: 2016-02-29)

    Devising new tools that expand our capabilities to sense and manipulate the world enables much of the scientific and technological progress around us. For example, light is increasingly more important as a tool for humanity. ...

    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 ...

    Graphene based optical interconnects and IR photodetectors 

    Agarwal, Hitesh (Date of defense: 2023-01-23)

    (English) Despite the extensive research in the semiconductor industry, Moore’s law is finally slowing down due to increased complexity. Hence, intense efforts are being carried out to explore hybrid solutions by adding ...

    Graphene mechanical resonators coupled to superconducting microwave cavities 

    Weber, Peter (Date of defense: 2016-12-02)

    In recent years, mechanical resonators based on graphene have attracted considerable interest as nanoelectromechanical systems (NEMS). Graphene NEMSs allow for exceptional properties such as high mechanical strength, high ...