Browsing by Subject "Quantum theory"
Now showing items 21-40 of 109
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Entanglement harvesting. Measurements and covariance
(Universitat Politècnica de Catalunya, 2022-05)
Bachelor thesis
Restricted access - author's decision
Covenantee: University of WaterlooL'entrellaçament quàntic contingut en un camp quàntic pot ésser extret acoblant al camp sistemes no relativistes anomenats detectors de partícules, fent servir un protocol conegut com a collita d'entrellaçament (entanglement ... -
Explorations of thermodynamics and information in quantum field theory
(Universitat Politècnica de Catalunya, 2020-05-20)
Bachelor thesis
Open Access
Covenantee: Institute for Quantum Computing / University of WaterlooPodria dir-se que la termodinàmica ha sigut una de les rames més poderoses de la física, i la més universal per la seva varietat d'aplicacions. Des de motors de vapor fins a forats negres, les lleis de la termodinàmica ... -
Exploring NbTiN superconducting single photon detectors with quantum detector tomography
(Universitat Politècnica de Catalunya, 2019-09-09)
Master thesis
Open AccessThe optical response of NbTiN superconducting single photon detectors is studied using quantum detector tomography which separates the detector response in single and multiple photon contributions. Three different NbTiN ... -
Exploring nonlocal correlations in many-body systems
(Universitat Politècnica de Catalunya, 2018-07-19)
Master thesis
Open AccessWe address the question of how to evaluate the Bell correlations depth, i.e. the number of parties sharing genuinely nonlocal correlations in a multipartite system. Previous work has shown that it is possible to construct ... -
External fluctuations in front propagation
(American Physical Society, 1996-04-01)
Article
Open AccessWe study the effects of external noise in a one-dimensional model of front propagation. Noise is introduced through the fluctuations of a control parameter leading to a multiplicative stochastic partial differential equation. ... -
First-passage times for a marginal state driven by colored noise
(The American Physical Society, 1991-01-18)
Article
Open AccessThe dynamical process through a marginal state (saddle point) driven by colored noise is studied. For small correlation time of the noise, the mean first-passage time and its variance are calculated using standard methods. ... -
Física cuántica : interferencias, correlaciones y realidad
(Iniciativa Digital Politècnica, 2015)
Book
Restricted access to the UPC academic communityLa física cuántica se ha erigido como uno de los pilares fundamentales sobre los cuales se asienta la física moderna. Es una puerta a un mundo fascinante, de características sorprendentes; un microcosmos regido por la ... -
Física e informática
(2005-09)
Article
Open Access -
From poly(3,4-ethylenedioxythiophene) to poly(3,4-phenylenedioxythiophene) : impact of the ethylene bridge by the phenyl ring in the molecular propierties
(Universitat Politècnica de Catalunya, 2010-09)
Master thesis
Restricted access - author's decisionThe structural and electronic properties of poly(3,4-phenylenedioxythiophene) and poly(3,4- ethylenedioxythiophene) have been studied using quantum mechanical methods. Calculations have been performed considering a series ... -
Ground-state wave-function optimization for a quantum system of N bosons
(Universitat Politècnica de Catalunya, 2020-06-29)
Bachelor thesis
Open AccessAquest treball s'emmarca en el camp de l'estudi i simulació del comportament de sistemes quàntics complexos, les propietats dels quals vénen dictades per les lleis de la física quàntica. Aquestes juguen un paper fonamental ... -
Highly efficient noise-assisted energy transport in classical oscillator systems
(2013-05)
Article
Open AccessPhotosynthesis is a biological process that involves the highly-efficient transport of energy captured from the sun to a reaction center, where conversion into useful biochemical energy takes place. Even though one can ... -
Holographic imaging of nanometer-scale phase-separation during a phase transition
(Universitat Politècnica de Catalunya, 2019-09-09)
Master thesis
Open AccessQuantum materials is a broad term used in condensed matter physics to define materials whose collective properties are governed by quantum behavior, which are challenging to understand. These materials are sensitive to ... -
Klein's paradox and the relativistic d-shell interaction in R3
(Mathematical Sciences Publishers, 2017-12-20)
Article
Open AccessUnder certain hypotheses of smallness on the regular potential V, we prove that the Dirac operator in Unexpected text node: 'R', coupled with a suitable rescaling of V, converges in the strong resolvent sense to the ... -
Large-scale cuantum computing simulation using tensor networks
(Universitat Politècnica de Catalunya, 2021-06-29)
Master thesis
Open AccessResource usage of traditional quantum computing simulation techniques scale exponentially fast either with the number of qubits or the depth of the circuit. Simulations of medium-sized circuits are then intractable but ... -
Llenguatges de Programació Quàntica
(Universitat Politècnica de Catalunya, 2009-06)
Master thesis (pre-Bologna period)
Open AccessAprofundir en els coneixements de computació quàntica, tant des del vessant de la física com des del vessant de la teoria de la computació, que em situïn en un punt de "pre-recerca". Tenir un mapa de les diferents ... -
Local discrimination of rotationally invariant states
(Universitat Politècnica de Catalunya / Universitat Autònoma de Barcelona, 2010)
Master thesis
Open AccessWe provide lower bounds for the minimum error discrimination probability of multipartite rotationally invariant states using separable measurements. The separability of the measurement operators has been investigated, ... -
Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres
(Nature Publishing Group, 2015-10-21)
Article
Restricted access - publisher's policyMore than 50 years ago1, John Bell proved that no theory of nature that obeys locality and realism2 can reproduce all the predictions of quantum theory: in any local-realist theory, the correlations between outcomes of ... -
Macroscopic Quantum State Analyzed Particle by Particle
(ACS Publications, 2015-03-27)
Article
Open AccessMacroscopic quantum phenomena, e.g., superconductivity and squeezing, are believed to result from entanglement of macroscopic numbers of particles. We report the first direct study of this kind of entanglement: we use ... -
Many-body bound states and induced interactions of charged impurities in a bosonic bath
(2023-12-01)
Article
Open AccessInduced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this ... -
Matter Bounce Scenario in F(T) gravity
(2016)
Article
Open AccessIt is shown that teleparallel F(T) theories of gravity combined with holonomy corrected Loop Quantum Cosmology (LQC) support a Matter Bounce Scenario (MBS) which is a potential alternative to the inflationary paradigm. The ...
