Exploració per tema "Quàntums, Teoria dels"
Ara es mostren els items 8-27 de 130
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Bloch oscillations in optical and Zeeman lattices in the presence of spin-orbit coupling
(2016-11-18)
Article
Accés obertWe address Bloch oscillations of a spin-orbit coupled atom in periodic potentials of two types: optical and Zeeman lattices. We show that in optical lattices the spin-orbit coupling allows controlling the direction of ... -
Bose polarons at finite temperature and strong coupling
(2018-02-01)
Article
Accés obertA mobile impurity coupled to a weakly interacting Bose gas, a Bose polaron, displays several interesting effects. While a single attractive quasiparticle is known to exist at zero temperature, we show here that the spectrum ... -
Bound states in the continuum in anisotropic structures
(Institute of Electrical and Electronics Engineers (IEEE), 2017)
Text en actes de congrés
Accés restringit per política de l'editorialWe report theoretical and experimental observation of radiationless bound states in the continuum (BIC) in waveguiding anisotropic structures. BICs may have all possible polarizations and be the only possible boundstates ... -
Bound states in the continuum in spin-orbit-coupled atomic systems
(2017-09-14)
Article
Accés restringit per política de l'editorialWe show that the interplay between spin-orbit coupling and Zeeman splitting in atomic systems can lead to the existence of bound states in the continuum (BICs) supported by trapping potentials. Such states have energies ... -
Can quantum effects due to a massless conformally coupled field avoid gravitational singularities?
(2012-04)
Article
Accés restringit per política de l'editorialUsing quantum corrections from massless fields conformally coupled to gravity, we study the possibility of avoiding singularities that appear in the flat Friedmann–Robertson–Walker model. We assume that the universe ... -
Characterizing and witnessing multipartite correlations : from nonlocality to contextuality
(Universitat Politècnica de Catalunya, 2014-02-10)
Tesi
Accés obertIn the past century, experimental discoveries have witnessed phenomena in Nature which challenge our everyday classical intuition. In order to explain these facts, quantum theory was developed, which so far has been able ... -
Characterizing entanglement and quantum correlations constrained by symmetry
(Universitat Politècnica de Catalunya, 2015-07-20)
Tesi
Accés obertEntanglement and nonlocal correlations constitute two fundamental resources for quantum information processing, as they allow for novel tasks that are otherwise impossible in a classical scenario. However, their elusive ... -
Coherent control of a superconducting quantum bit
(Universitat Politècnica de Catalunya, 2019-09-06)
Projecte Final de Màster Oficial
Accés obertTransmon qubits are at the forefront of solid state platforms for quantum computing. In this thesis, results obtained from the experimental study of a transmon qubit in a 3D cavity are presented. A complete view of the ... -
Competing order in two-band Bose-Hubbard chains with extended-range interactions
(American Physical Society (APS), 2024-03)
Article
Accés obertMotivated by the recent progress in realizing and controlling extended Bose-Hubbard systems using excitonic or atomic devices, the present Letter theoretically investigates the case of a two-band Bose-Hubbard chain with ... -
Complex systems for quantum technologies
(Universitat Politècnica de Catalunya, 2011-07-12)
Tesi
Accés obert -
Complexity Reduction in Large Quantum Systems: Fragment Identification and Population Analysis via a Local Optimized Minimal Basis
(American Chemical Society, 2017-07-21)
Article
Accés obertWe present, within Kohn–Sham density functional theory calculations, a quantitative method to identify and assess the partitioning of a large quantum-mechanical system into fragments. We then show how within this framework ... -
Computación cuántica : nuevas perspectivas en el tratamiento de la información
(Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 2000)
Article
Accés obert -
Conformal data from finite entanglement scaling
(APS Physics, 2015-01-20)
Article
Accés obertIn this paper, we apply the formalism of translation invariant (continuous) matrix product states in the thermodynamic limit to (1 + 1)-dimensional critical models. Finite bond dimension bounds the entanglement entropy ... -
de Koning et al. Reply: [to Comment on "Absence of off-diagonal long-range order in hcp 4He dislocation cores"]
(American Institute of Physics (AIP), 2023-10-31)
Article
Accés obert -
Detection of nonlocality with two-body correlation functions
(Universitat Politècnica de Catalunya, 2015-09-10)
Projecte Final de Màster Oficial
Accés obertNonlocality detection in multipartite quantum systems is of great interest. The most popular tool to detect nonlocality in quantum systems are Bell inequalities. Most of the provided constructions of multipartite Bell ... -
Development of hole selective contacts on p-type c-Ge substrates
(Universitat Politècnica de Catalunya, 2020-12)
Projecte Final de Màster Oficial
Accés obertThermophotovoltaic devices convert heat to electricity by absorbing infra-red photons with low energies. In order to do so semiconductors materials with low band-gap are needed. The crystalline Germanium (cGe) is an ... -
Device-independent information protocols: measuring dimensionality, randomness and nonlocality
(Universitat Politècnica de Catalunya, 2013-02-22)
Tesi
Accés obertThe device-independent formalism is a set of tools to analyze experimental data and infer properties about systems, while avoiding almost any assumption about the functioning of devices. It has found applications both in ... -
Dicke superradiance in atomic arrays: impact of dimensionality
(Universitat Politècnica de Catalunya, 2021-10-01)
Treball Final de Grau
Accés obert
Realitzat a/amb: Columbia UniversityEls efectes colectius són un àmbit de creixent interès en l'estudi de les interaccions llum-matèria a nivell quàntic. Aquest treball es centra en un d'aquests efectes conegut com la superradiància de Dicke, en la qual un ... -
Dynamic structure factor of liquid He 4 across the normal-superfluid transition
(2016-03-08)
Article
Accés obertWe have carried out a microscopic study of the dynamic structure factor of liquid He4 across the normal-superfluid transition temperature using the path integral Monte Carlo method. The ill-posed problem of the inverse ... -
Dynamics of equilibration and collisions in ultradilute quantum droplets
(American Physical Society, 2021-12-01)
Article
Accés obertEmploying time-dependent density-functional theory, we have studied dynamical equilibration and binary head-on collisions of quantum droplets taking as a case of study droplets made of a 39K-39K Bose mixture. The phase ...