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Dissertations / Theses on the topic 'Nonlocality'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Azish, Parham. "Residual Bell Nonlocality." Thesis, Uppsala universitet, Materialteori, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415162.

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This report provides a new theoretical measure for the nonlocality of an arbitrary three-qubit pure state system similar to the method used to describe tripartite entanglement, resulting in a concept referred to as residual nonlocality, η. This report also investigates the special cases that can be encountered when using η. This method assigns a numerical value between 0 and 1 in order to indicate the degree of nonlocality between three-qubits. It was discovered that η has the characteristic of being consistently larger or equal to the value found for the residual entanglement which can provid

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2

Toner, Benjamin Francis Preskill John P. Preskill John P. "Quantifying quantum nonlocality /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-05222007-125036.

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3

Dam, Wim van. "Nonlocality and communication complexity." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325982.

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4

Ver, Steeg Gregory Lee Preskill John P. Preskill John P. "Foundational aspects of nonlocality /." Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-05282009-115941.

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5

Würflinger, Lars Erik. "Nonlocality in multipartite correlation networks." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/129918.

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Despite the success of quantum mechanics in predicting the outcomes of experiments in many branches of physics, the foundations of the theory have remained subject of research and dispute. At the basis of this struggle with the theory lie the phenomena of nonlocality and entanglement. Since it was first predicted by Bell in 1964, nonlocality was not only verified in numerous experiments, but also identified as a useful resource for quantum information processing. Thus, the study of nonlocality is important both from a fundamental point of view and with respect to new applications in quantum in

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6

Bourdoncle, Boris. "Quantifying randomness from Bell nonlocality." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/666591.

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The twentieth century was marked by two scientific revolutions. On the one hand, quantum mechanics questioned our understanding of nature and physics. On the other hand, came the realisation that information could be treated as a mathematical quantity. They together brought forward the age of information. A conceptual leap took place in the 1980's, that consisted in treating information in a quantum way as well. The idea that the intuitive notion of information could be governed by the counter-intuitive laws of quantum mechanics proved extremely fruitful, both from fundamental and applied

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7

Lerays, Virginie. "Quantum nonlocality and communication complexity." Paris 7, 2014. http://www.theses.fr/2014PA077151.

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Les fondements de l'informatique ont subi un bouleversement face à l'émergence du calcul quantique comme nouveau modèle de calcul. Nous nous intéresserons dans cette thèse à la complexité de la communication, vue sous l'angle de la théorie de l'information quantique. En complexité de la communication, on cherche à savoir combien de communication il faut pour résoudre des problèmes où les entrées sont réparties entre les entités de calcul. Cette thèse présente un moyen d'obtenir des bornes inférieures en complexité de la communication en exploitant des idées liées à l'étude de phénomènes quanti

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8

Silva, Ralph Francisco. "Entanglement, nonlocality, postselection and thermodynamics." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.686187.

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In this second part of the thesis, we turn to the study of thermodynamics at the quantum scale, with a special focus on small thermal machines. To begin with, in Chapter 4, we look at the concept of a virtual temperature, as introduced in [43]. This is a temperature calculated for any pair of energy levels in a diagonal state by matching the ratio of its populations to the Gibbs state. The small quantum fridge introduced in Chapter 5, as well as all of the other small quantum thermal machines may be understood in terms of the virtual temperatures that they are able to generate within a system.

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9

Berkovitz, Joseph Zvi. "Quantum nonlocality : an analysis of the implications of Bell's Theorem and quantum correlations for nonlocality." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/265449.

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Bell's Theorem demonstrates that factorizable theories for the EPR experiment (EPR) cannot reproduce the quantum correlations. Factorizability is motivated by various locality conditions. So to understand the nature of nonlocality in EPR, we first need to understand the conceptual relations between factorizability, these various locality conditions and the nature of the quantum correlations. That is the main focus of my thesis. My main conclusion is that these conceptual relations are more subtle than the literature has usually suggested. Chapter 1 is a general introduction. In Chapter 2, I re

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10

Skrzypczyk, Paul Alan. "Aspects of nonlocality and quantum thermodynamics." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.550302.

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This thesis is a tale of two stories. The first half of this thesis is dedicated to the study of nonlocality. We know that nature is inherently nonlocal, however, the nonlocal correlations allowed by quantum mechanics are limited; we could conceivably have correlations which are 'more' nonlocal and still cause no conflict with relativity. In this thesis I explore this limita- tion by studying nonlocality beyond quantum mechanics from a number of directions, relating mostly to dynamics and transformations. I show that the analogue of entanglement swapping and teleportation can in fact be implem

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11

Cohen, Oliver. "Quantum mechanics, nonlocality, and Lorentz invariance." Thesis, Birkbeck (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243368.

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12

Dilley, Daniel. "Analyzing asymmetric nonlocality experiments with relaxed conditions." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/dissertations/1696.

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It is already known that one can always find a set of measurements on any two-qubit entangled state that will lead to a violation of the CHSH inequality. We provide an explicit state in terms of the angle between Alice's choice of measurements and the angle between Bob's choice of measurements, such that the CHSH inequality is always violated provided Alice's or Bob's choice of inputs are not collinear. We prove that inequalities with a corresponding Bell operator written as a linear combination of tensor products of Pauli matrices, excluding the identity, will generate the most nonlocal corre

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13

Laversanne-Finot, Adrien. "Contextuality and nonlocality in continuous variable systems." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC220/document.

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La mécanique quantique présente des propriétés étonnantes qui n'ont pas d'équivalent en physique classique. Ces propriétés sont au cœur des applications possibles de la mécanique quantique. Le thème principal de cette thèse est l'étude de deux des propriétés fondamentales de la mécanique quantique: la non-localité et la contextualité. Dans ce cadre, nous poursuivrons deux objectifs: premièrement, nous étudierons comment certains résultats obtenus pour les systèmes discrets peuvent être étendus aux systèmes décrits par des variables continues; deuxièmement nous étudierons comment il est possibl

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14

Sofer, Miguel Marcelo. "On equilibrium, stability and nonlocality in elasticity theory /." [S.l.] : [s.n.], 1991. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9420.

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15

Sypel, Roland. "An analysis of nonlocality in modern physical theory." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386471.

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16

Bucur, C. D. "SOME NONLOCAL OPERATORS AND EFFECTS DUE TO NONLOCALITY." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/488032.

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In this thesis, we deal with problems related to nonlocal operators, in particular to the fractional Laplacian and some other types of fractional derivatives. We make an extensive introduction to the fractional Laplacian and to some related contemporary research themes. We add to this some original material: the potential theory of this operator and a proof of Schauder estimates with the potential theory approach, the study of a fractional elliptic problem in $mathbb{R}^n$ with convex nonlinearities and critical growth, and a stickiness property of $s$-minimal surfaces as $s$ gets small. Also,

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17

BUCUR, CLAUDIA DALIA. "Some nonlocal operators and effects due to nonlocality." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/10281/277792.

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In this thesis, we deal with problems related to nonlocal operators, in particular to the fractional Laplacian and to some other types of fractional derivatives (the Caputo and the Marchaud derivatives). We make an extensive introduction to the fractional Laplacian, we present some related contemporary research results and we add some original material. Indeed, we study the potential theory of this operator, introduce a new proof of Schauder estimates using the potential theory approach, we study a fractional elliptic problem in Rn with convex nonlinearities and critical growth and we presen

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18

Proulx, Marc-Olivier. "A Limit on Quantum Nonlocality from an Information Processing Principle." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38001.

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Quantum entanglement is known to give rise to nonlocal correlations that are not possible in a classical theory. Even though quantum correlations are stronger than classical correlations, they are still limited by the mathematical structure of quantum mechanics. Since physical limits usually emerge from physical principles, multiple principles were suggested in order to give a more physical explanation of the quantum limit on nonlocal correlations. None of these principles were able to completely rule out all super-quantum correlations. In this work, we study the principle of non-trivia

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19

Gallego, López Rodrigo. "Device-independent information protocols: measuring dimensionality, randomness and nonlocality." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/108178.

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The 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 fundamental and applied physics: some examples are the characterization of quantum nonlocality and information protocols for secure cryptography or randomness generation. This thesis contains novel results on these topics and also new applications such as deviceindependent test for dimensionality. After an introduction to the field, the thesis is divided in four parts. In

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20

Sainz, Ana Belén. "Characterizing and witnessing multipartite correlations : from nonlocality to contextuality." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/144528.

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In 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 to reproduce the observed results. However, I believe that our understanding of quantum mechanics can be significantly improved by the search for an operational meaning behind its mathematical formulation, which would help to identify the limitations and possibilities of the theory for information processing. An intriguing property of quantum theory is its intrinsic randomness

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21

Clifton, Robert Kenneth. "Nonlocality in quantum mechanics : signalling, counterfactuals, probability and causation." Thesis, University of Cambridge, 1991. https://www.repository.cam.ac.uk/handle/1810/283676.

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22

Aloy, López Albert. "Exploring quantum many-body systems from an entanglement and nonlocality perspective." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/669581.

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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 well as key resources for emerging quantum technologies. However, the lack for general and efficient criteria to characterize them in many-body systems poses many challenges, often intractable. Consequently, despite the growing interest in their properties, the role of entanglement and non-local correlations in many-body systems remains largely unexplored. The subject of the

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23

Niset, Julien. "Quantum information with optical continuous variables: nonlocality, entanglement, and error correction." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210459.

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L'objectif de ce travail de recherche est l'étude des posibilités offertes par une nouvelle approche de l'information quantique basée sur des variables quantiques continues. Lorsque ces variables continues sont portées par le champs éléctromagnétique, un grand nombre de protocoles d'information quantique peuvent être implémentés à l'aide de lasers et d'éléments d'optique linéaire standards. Cette simplicité expérimentale rend cette approche très intéressantes d'un point de vue pratique, en particulier pour le développement des futurs réseaux de communications quantiques.<p><p>Le travail peut s

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24

Hardy, Lucien. "Nonlocality, violation of Lorentz invariance, and wave-particle duality in quantum theory." Thesis, Durham University, 1992. http://etheses.dur.ac.uk/6079/.

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This thesis addresses some of the consequences of giving quantum mechanics a realist interpretation. We consider three main topics: wave-particle duality, locality, and Lorentz invariance. First we show that classical particles alone or classical waves alone cannot explain all single particle quantum phenomena. Then we consider the possibility that a quantum particle is composed of a particle and a wave, both being taken to exist objectively. We are able to demonstrate the reality of empty waves (that is, waves without a particle) if we make three realist motivated assumptions. The main part o

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25

Lam, M. M. "A computer simulation of nonlocality using the causal interpretation of quantum mechanics." Thesis, University of Portsmouth, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357145.

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26

Girdhar, Parth. "Probing Foundations of Quantum Mechanics: A Study into Nonlocality and Quantum Gravity." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/24531.

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This thesis is about probing aspects of the foundations of quantum mechanics. Firstly, two notions of quantum nonlocality are explored: EPR-steering, the ability to control a remote quantum state, and Bell nonlocality, the inconsistency of a theory with local causality. A necessary and sufficient witness of Einstein-Podolsky- Rosen (EPR) steering is derived for a two qubit system employing only correlations between two arbitrary dichotomic measurements on each party. It is demonstrated that all states that are EPR-steerable with such correlations are also Bell nonlocal, a surprising equivalen

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27

Wilson, D. "Dynamics of nonlocality and quantum correlations for a quantum system in an environment." Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398178.

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28

Movahhedian, Hossein. "Locality, Lorentz invariance and the Bohm model." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4829/.

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Non-local forces exist in nature for two reasons. First that the recent experiments on locality are supposed to be accurate enough. Second that there is no local theory that can reproduce all the predictions of orthodox quantum theory which, almost for about a century, have been proved to be correct experimentally again and again. This thesis concerns both of these. A brief discussion of the measurement in quantum theory is followed by two comments which show that the quantum description is frame dependent and that the collapse of the wave-function of a system may occur without the relevant me

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29

Janotta, Peter [Verfasser], and Haye [Gutachter] Hinrichsen. "Nonlocality and entanglement in Generalized Probabilistic Theories and beyond / Peter Janotta. Gutachter: Haye Hinrichsen." Würzburg : Universität Würzburg, 2014. http://d-nb.info/1102828599/34.

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30

Saunders, Dylan John. "Quantum Correlations: Experimental EPR-Steering, Bilocality and Weak Tomography in Photonic Quantum Information Science." Thesis, Griffith University, 2013. http://hdl.handle.net/10072/367406.

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Quantum mechanics has led to the biggest technological breakthroughs of last century. However, many paradoxes still remain in the foundations of quantum theory. In this research we study one effect that leads to such paradoxes; quantum correlations. Quantum nonlocality refers to the set of quantum correlations that are not explainable using local models. It is quantum nonlocality that has troubled physicists since the inception of quantum theory nearly 100 years ago. However, these nonlocal quantum correlations offer a range of advantages in quantum information tasks. For example, quantum key

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31

Lawson, Thomas Montagu. "A theoretical and experimental study into quantum nonlocality, the applications of quantum entanglement and the thermodynamics of small systems." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546193.

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32

Holz, Timo [Verfasser], Dagmar [Akademischer Betreuer] Bruß, Dagmar [Gutachter] Bruß, and Hermann [Gutachter] Kampermann. "Device-independent Quantum Key Distribution and the Role of Bell Nonlocality / Timo Holz ; Gutachter: Dagmar Bruß, Hermann Kampermann ; Betreuer: Dagmar Bruß." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2020. http://d-nb.info/1211554627/34.

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33

Dilley, Daniel Jacob. "An Insight on Nonlocal Correlations in Two-Qubit Systems." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/2069.

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In this paper, we introduce the motivation for Bell inequalities and give some background on two different types: CHSH and Mermin's inequalities. We present a proof for each and then show that certain quantum states can violate both of these inequalities. We introduce a new result stating that for four given measurement directions of spin, two respectively from Alice and two from Bob, which are able to produce a violation of the Bell inequality for an arbitrary shared quantum state will also violate the Bell inequality for a maximally entangled state. Then we provide another new result that c

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34

Waegell, Mordecai. "Nonclassical Structures within the N-qubit Pauli Group." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/150.

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Structures that demonstrate nonclassicality are of foundational interest in quantum mechanics, and can also be seen as resources for numerous applications in quantum information processing - particularly in the Hilbert space of N qubits. The theory of entanglement, quantum contextuality, and quantum nonlocality within the N-qubit Pauli group is further developed in this thesis. The Strong Kochen-Specker theorem and the structures that prove it are introduced and explored in detail. The pattern of connections between structures that show entanglement, contextuality, and nonlocality is explained

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35

Neto, Gentil Dias de Moraes. "Transferência e manipulação de informação quântica via tunelamento dissipativo não local." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-23082013-093243/.

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Nesta tese abordamos o problema de transferência e manipulação de informação quântica em sistemas dissipativos. Inicialmente apresentamos uma técnica para construir, dentro de redes bosônicas dissipativas, canais livres de decoerência (CLD): um grupo de modos normais de osciladores com taxas de amortecimento efetivas nulas. Verificamos que os estados protegidos dentro do CLD definem subespaços livres de decoerência (SLD) quando mapeados de volta para a base dos osciladores naturais da rede. Portanto, a nossa técnica para obter canais protegidos formados por modos normais é uma forma alternativ

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36

Moreau, Paul-Antoine. "Aspects spatiaux de l'intrication en amplification paramétrique : paradoxe Einstein-Podolsky-Rosen dans les images jumelles et expérience de Hong-Ou-Mandel." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2026/document.

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Nous étudions les aspects spatiaux de l’intrication, d’une part dans le cadre de la génération d’états intriqués de haute dimensionnalité par amplification paramétrique optique, et d’autre part dans le cadre des expériences dites de Hong- Ou- Mandel. La première partie de cette étude s’attache à démontrer l’existence d’un paradoxe Einstein-Podolsky-Rosen (EPR) dans le comportement de la lumière de fluorescence générée par un amplificateur paramétrique optique. Le paradoxe EPR estétudié dans le contexte de sa formulation originelle, c’est-à-dire dans le domaine des positions et impulsions. La d

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Pope, James Edward. "Free will in device-independent cryptography." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:8d3ce92a-e9dc-4344-b5f3-8e68897d992c.

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Device-independent cryptography provides security in various tasks whilst removing an assumption that cryptographers previously thought of as crucial -- complete trust in the machinations of their experimental apparatus. The theory of Bell inequalities as a proof of indeterminism within nature allows for secure device-independent schemes requiring neither trust in the cryptographers' devices nor reliance on the completeness of quantum mechanics. However, the extreme paranoia attributable to the relaxed assumptions within device independence requires an explicit consideration of the previously

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38

Ozonder, Sener. "Viable Higher Derivative Theories." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608468/index.pdf.

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In this thesis, higher derivative theories are investigated. Ostrogradskian instability of higher derivative theories is examined both at the classical and quantum levels. It is shown that avoiding the instability in nondegenerate higher derivative theories is impossible. Moreover, the degenerate model of relativistic particle with a curvature term is studied as a viable higher derivative theory. Most of the work we present here is not original. We give a review of the literature and compile various detached works that already exist.

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Benedicto, Jessica. "Contribution à l'étude des propriétés optiques des métamatériaux hyperboliques." Thesis, Clermont-Ferrand 2, 2013. http://www.theses.fr/2013CLF22403/document.

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A la fin des années 80, ont été introduits les cristaux photoniques et les métamatériaux, permettant de concevoir des dispositifs avec des propriétés optiques très intéressantes. La découverte de ces propriétés artificielles est considérée comme l’une des avancées les plus spectaculaires de la photonique moderne, avec des applications importantes telles que la création de matériaux à réfraction négative, ou la conception de lentilles plates parfaites. Ces structures présentent néanmoins des pertes optiques dues aux métaux qui rendent plus difficile l’obtention de lentilles super-résolues. Une

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Nieto-Silleras, Olmo. "Device-independent randomness generation from several Bell estimators." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/271365.

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The device-independent (DI) framework is a novel approach to quantum information science which exploits the nonlocality of quantum physics to certify the correct functioning of a quantum information processing task without relying on any assumption on the inner workings of the devices performing the task. This thesis focuses on the device-independent certification and generation of true randomness for cryptographic applications. The existence of such true randomness relies on a fundamental relation between the random character of quantum theory and its nonlocality, which arises in the context

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41

ROSATI, ROBERTO. "Microscopic modeling of energy dissipation and decoherence in nanoscale materials and devices." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2599755.

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Primary goal of this thesis work is to develop and implement microscopic modeling strategies able to describe semiconductor-based nanomaterials and nanodevices, overcoming both the intrinsic limits of the semiclassical transport theory and the huge computational costs of non Markovian approaches. The progressive reduction of modern optoelectronic devices space-scales, triggered by the evolution on semiconductor heterostructures at the nanoscale, together with the decrease of the typical time-scales involved, pushes device miniaturization toward limits where the application of the traditional B

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42

Petty, Taylor Michael. "Nonlocally Maximal Hyperbolic Sets for Flows." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5558.

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In 2004, Fisher constructed a map on a 2-disc that admitted a hyperbolic set not contained in any locally maximal hyperbolic set. Furthermore, it was shown that this was an open property, and that it was embeddable into any smooth manifold of dimension greater than one. In the present work we show that analogous results hold for flows. Specifically, on any smooth manifold with dimension greater than or equal to three there exists an open set of flows such that each flow in the open set contains a hyperbolic set that is not contained in a locally maximal one.

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Hussain, Mallik Mohd Raihan. "Effective Nonlinear Susceptibilities of Metal-Insulator and Metal-Insulator-Metal Nanolayered Structures." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1591207594352716.

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Nasri, Amine. "Microscopic nonlocal potentials for the study of scattering observables of nucleons within the coupled channel framemork." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS273/document.

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Une bonne compréhension et une bonne capacité de prédiction de la section efficace de diffusion de neutron est essentielle à un grand nombre de technologies nucléaires, parmi lesquelles les réacteurs à fission. Pour les noyaux déformés, le calcul des observables de diffusion de nucléon pour la voie élastique et les premiers états excités de basse énergie requiert l'utilisation de calcul en voies couplées. Des potentiels optique et de transition phénoménologiques locaux sont le plus couramment utilisés dans les analyses par voies couplées, mais leur précision en dehors de leur domaine d'ajustem

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Baamara, Youcef. "Gaz quantiques, corrélations et métrologie quantique." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS482.

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Dans la première partie de cette thèse, nous explorons le potentiel des états de spin non gaussiens, en proposant des cadres analytiques et en suggérant des implémentations pratiques, pour améliorer la précision dans les applications d'estimation de paramètres et de cartographie de champs. Nous identifions initialement le gain quantique offert par les états de spin surcomprimés générés par la dynamique dite "one-axis twisting" en fonction du temps, en tenant compte systématiquement de différents processus de décohérence. Malgré un avantage quantique métrologique dépassant celui des états compr

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Ciliberto, Giorgio. "Non-locality and Back-reaction in Acoustic Black Holes and Non-linearity in Quantum Fluid Dynamics." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP174.

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Cette thèse porte essentiellement sur les corrélations quantiques et les fluctuations non-lineaires dans les fluides quantiques. Elle se concentre spéficiquement sur les fluctuations quantiques collectives, à savoir les ondes sonores, dans le flux stationnaire d'un quasi- condensat 1D de Bose-Einstein qui présente un horizon acoustique, c'est-à-dire une transition du flux d'un régime subsonique à un régime supersonique. Les phénomènes quantiques générés par la présence de l'horizon sont étudiés. La thèse présente également un bref excursus sur les turbulences dans un fluide quantique bidimensi

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47

Yang, Zhengzheng. "Nonlocally related partial differential equation systems, the nonclassical method and applications." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44993.

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Symmetry methods are important in the analysis of differential equation (DE) systems. In this thesis, we focus on two significant topics in symmetry analysis: nonlocally related partial differential equation (PDE) systems and the application of the nonclassical method. In particular, we introduce a new systematic symmetry-based method for constructing nonlocally related PDE systems (inverse potential systems). It is shown that each point symmetry of a given PDE system systematically yields a nonlocally related PDE system. Examples include applications to nonlinear reaction-diffusion equ

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48

Moeferdt, Matthias. "Nonlocal and Nonlinear Properties of Plasmonic Nanostructures Within the Hydrodynamic Drude Model." Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18129.

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In dieser Arbeit werden die nichtlokalen sowie nichtlinearen Eigenschaften plasmonischer Nanopartikel behandelt, wie sie im hydrodynamischen Modell enthalten sind. Das hydrodynamische Materialmodell stellt eine Erweiterung des Drude Modells dar, in der Korrekturen in der Beschreibung des Elektronenplasmas berücksichtigt werden. Einer ausführlichen Einführung des Materialmodells folgt eine analytische Diskussion der Auswirkungen der Nichtlokalität am Beispiel eines einzelnen Zylinders. Hierbei werden die durch die Nichtlokalität herbeigeführten Frequenzverschiebungen in den Streu- und Absorptio

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Kaijser, Thomas. "Convergence in distribution for filtering processes associated to Hidden Markov Models with densities." Linköpings universitet, Matematik och tillämpad matematik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-92590.

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A Hidden Markov Model generates two basic stochastic processes, a Markov chain, which is hidden, and an observation sequence. The filtering process of a Hidden Markov Model is, roughly speaking, the sequence of conditional distributions of the hidden Markov chain that is obtained as new observations are received. It is well-known, that the filtering process itself, is also a Markov chain. A classical, theoretical problem is to find conditions which implies that the distributions of the filtering process converge towards a unique limit measure. This problem goes back to a paper of D Blackwell f

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Toner, Benjamin Francis. "Quantifying quantum nonlocality." Thesis, 2007. https://thesis.library.caltech.edu/1956/1/thesis.pdf.

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Quantum mechanics is nonlocal, meaning it cannot be described by any classical local hidden variable model. In this thesis we study two aspects of quantum nonlocality. Part I addresses the question of what classical resources are required to simulate nonlocal quantum correlations. We start by constructing new local models for noisy entangled quantum states. These constructions exploit the connection between nonlocality and Grothendieck's inequality, first noticed by Tsirelson. Next, we consider local models augmented by a limited amount of classical communication. After generalizing Bell in

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