Relevant bibliographies by topics / Quantum many-body systems / Dissertations / Theses
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Dissertations / Theses on the topic 'Quantum many-body systems'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Riera, Graells Arnau. "Entanglement in Many Body Quantum Systems." Doctoral thesis, Universitat de Barcelona, 2010. http://hdl.handle.net/10803/1600.

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THESIS SUMMARY<br/><br/>TEXT:<br/><br/>This thesis is made of two parts. In the first one, the issue of entanglement in many body systems is addressed. The concept of entanglement and some of the recent progress on the study of entropy of entanglement in many body quantum systems are reviewed. Emphasis is placed on the scaling properties of entropy for one-dimensional models at quantum phase transitions. <br/><br/>Then, we focus on the area-law scaling of the entanglement entropy. An explicit computation in arbitrary dimensions of the entanglement entropy of the ground state of a discretized s
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2

Scarlatella, Orazio. "Driven-Dissipative Quantum Many-Body Systems." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS281/document.

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Ma thèse de doctorat était consacrée à l'étude des systèmes quantiques à plusieurs corps dissipatifs et pilotés. Ces systèmes représentent des plateformes naturelles pour explorer des questions fondamentales sur la matière dans des conditions de non-équilibre, tout en ayant un impact potentiel sur les technologies quantiques émergentes. Dans cette thèse, nous discutons d'une décomposition spectrale de fonctions de Green de systèmes ouverts markoviens, que nous appliquons à un modèle d'oscillateur quantique de van der Pol. Nous soulignons qu’une propriété de signe des fonctions spectrales des s
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3

Mur, Petit Jordi. "Many-body studies on atomic quantum systems." Doctoral thesis, Universitat de Barcelona, 2006. http://hdl.handle.net/10803/1587.

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En aquesta tesi presentem un conjunt d'estudis sobre sistemes atòmics on els efectes quàntics són especialment destacats. Aquests estudis s'han dut a terme aplicant diverses tècniques de la física teòrica de molts cossos.<br/><br/>En primer lloc hem estudiat la possible existència d'una transició de fase superfluida en un gas ultrafred d'àtoms fermiònics, mitjançant una generalització de la teoria BCS de la superconductivitat que dóna especial rellevància al paper jugat per l'asimetria de densitat entre les dues espècies, i permet que l'estat fonamental presenti un trencament espontani de sime
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4

Heyl, Markus Philip Ludwig. "Nonequilibrium phenomena in many-body quantum systems." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-145838.

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5

Costa, De Almeida Ricardo. "Entanglement certification in quantum many-body systems." Doctoral thesis, Università degli studi di Trento, 2022. https://hdl.handle.net/11572/356801.

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Entanglement is a fundamental property of quantum systems and its characterization is a central problem for physics. Moreover, there is an increasing demand for scalable protocols that can certify the presence of entanglement. This is primarily due to the role of entanglement as a crucial resource for quantum technologies. However, systematic entanglement certification is highly challenging, and this is particularly the case for quantum many-body systems. In this dissertation, we tackle this challenge and introduce some techniques that allow the certification of multipartite entanglement in ma
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6

Biella, Alberto. "Many-body physics in open quantum systems." Doctoral thesis, Scuola Normale Superiore, 2016. http://hdl.handle.net/11384/85905.

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7

Tomadin, Andrea. "Dynamical instabilities in quantum many-body systems." Doctoral thesis, Scuola Normale Superiore, 2010. http://hdl.handle.net/11384/85874.

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from the introduction: "[...] This thesis addresses the problem of the nonequilibrium time-evolution of many-body sistems realized with quantum simulators. We investigate theoretically the relation between the time-evolution and the equilibrium phase diagram in the presence of a quantum phase transition. The long-time evolution of the systems is investigated, both in the case of conservative dynamics and under the action of dissipative processes. The thesis is organized as follows. Chaps. 1-3 contain theoretical and experimental facts that are relevant to the present work. In the Chap.
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8

Mertens, Christopher J. "Many-body theory of dissipative quantum optical systems." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/30316.

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9

Elliott, Thomas Joseph. "Topics in quantum measurement of many-body systems." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:c3c792c8-c184-41a3-abfc-868f5965a852.

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In quantum physics, measurement exhibits fundamentally different behaviour to the classical case, having direct effect on the observed system. As a result, the very act of observation in quantum systems plays a non-trivial role, and can be used as a method of controlling the dynamics of the system. With the rise of quantum technologies, understanding and exploiting these phenomena offers a great boon. Here, we investigate a selection of the possibilities offered by quantum measurement for characterising and manipulating many-body systems, with particular focus on ultracold atomic gases. We fir
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10

Fusco, Lorenzo. "Non-equilibrium thermodynamics in quantum many-body systems." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706680.

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Thermodynamics is one of the pillars of modern science. Understanding which are the boundaries for the applicability of a theory is fundamental for every science and thermodynamics makes no exception. This Thesis studied the implications of thermodynamic transformations applied to quantum systems, particularly discussing the limits of a proper thermodynamic interpretation of such a transformation for a quantum many-body system. First a framework is developed to give a physical meaning to the full statistics of the work distributions for a many-body system, with particular emphasis on the quant
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11

Henriet, Loïc. "Non-equilibrium dynamics of many body quantum systems." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX036/document.

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Cette thèse porte sur l'étude de propriétés dynamiques de modèles quantiques portés hors équilibre. Nous introduisons en particulier des modèles généraux de type spin-boson, qui décrivent par exemple l'interaction lumière-matière ou certains phénomènes de dissipation. Nous contribuons au développement d'une approche stochastique exacte permettant de d'écrire la dynamique hors équilibre du spin dans ces modèles. Dans ce contexte, l'effet de l'environnement bosonique est pris en compte par l'intermédiaire des degrés de liberté stochastiques supplémentaires, dont les corrélations temporelles dépe
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12

Rotondo, P. "EMERGENT COLLECTIVE PHENOMENA IN QUANTUM MANY-BODY SYSTEMS." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/361054.

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Motivated by a recent proposal by Lev and coworkers, in the first part of this thesis, we will perform a theoretical investigation of a new class of quantum simulators: the so called multimode disordered Dicke simulators. Our approach is mostly inspired from Statistical Mechanics: indeed we will merge together exact results obtained in the context of the Dicke model by Hepp and Lieb, with known results on disordered systems and neural networks. In this way we will be able to generalize the standard approach to the superradiant phase transition to the disordered case. As a byproduct of this an
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13

Hallnäs, Martin. "Quantum many-body systems exactly solved by special functions." Doctoral thesis, KTH, Teoretisk fysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4416.

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This thesis concerns two types of quantum many-body systems in one dimension exactly solved by special functions: firstly, systems with interactions localised at points and solved by the (coordinate) Bethe ansatz; secondly, systems of Calogero-Sutherland type, as well as certain recently introduced deformations thereof, with eigenfunctions given by natural many-variable generalisations of classical (orthogonal) polynomials. The thesis is divided into two parts. The first provides background and a few complementary results, while the second presents the main results of this thesis in five appen
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14

Hernández, Santana Senaida. "Local temperature and correlations in quantum many-body systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/666722.

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Quantum Mechanics was established as the theory of the microscopic world, which allowed to understand processes in atoms and molecules. Its emergence led to a new scientific paradigm that quickly spread to different research fields. Two relevant examples are Quantum Thermodynamics and Quantum Many-Body Theory, where the former aims to characterize thermodynamic processes in quantum systems and the latter intends to understand the properties of quantum many-body systems. In this thesis, we tackle some of the questions in the overlap between these disciplines, focusing on the concepts of tempera
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15

Hallnäs, Martin. "Exactly solved quantum many-body systems in one dimension." Licentiate thesis, KTH, Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-564.

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<p>This thesis is devoted to the study of various examples of exactly solved quantum many-body systems in one-dimension. It is divided into two parts: the ¯rst provides background and complementary results to the second, which consists of three scienti¯c papers. The ¯rst paper concerns a particu- lar extension, corresponding to the root system CN, of the delta-interaction model. We prove by construction that its exact solution, even in the gen- eral case of distinguishable particles, can be obtained by the coordinate Bethe ansatz. We also elaborate on the physical interpretation of this model.
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16

Biamonte, Jacob Daniel. "Categorical models of quantum information in many-body systems." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540124.

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17

Hallnäs, Martin. "Quantum many-body systems exactly solved by special functions /." Stockholm : Department of Theoretical Physics, Royal Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4416.

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18

Ros, Valentina. "Aspects of localization in disordered many-body quantum systems." Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4906.

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For a quantum system to be permanently out-of-equilibrium, some non-trivial mechanism must be at play, to counteract the general tendency of entropy increase and flow toward equilibration. Among the possible ways to protect a system against local thermalization, the phenomenon of localization induced by quenched disorder appears to be one of the most promising. Although the problem of localization was introduced almost sixty years ago, its many-body version is still partly unresolved, despite the recent theoretical effort to tackle it. In this thesis we address a few aspects of the localized
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19

Keck, Maximilian. "Many-body open quantum systems: from dynamics to thermodynamics." Doctoral thesis, Scuola Normale Superiore, 2019. http://hdl.handle.net/11384/85919.

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This thesis studies problems concerning the dynamics and thermodynamics of manybody quantum systems. We start by introducing the necessary theoretical concepts and tools forming the basis of this manuscript. The research presented can be split in two parts. The first one deals with the dynamics of many-body quantum systems subject to environmental dissipative effects of various forms, while the second one studies topics of thermodynamics in many-body quantum systems. The first part of the research presented studies the effects of an environment inducing dissipation. We establish and stu
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20

Shi, Bowen. "Anyon theory in gapped many-body systems from entanglement." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587705058308889.

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21

Kshetrimayum, Augustine [Verfasser]. "Quantum many-body systems and Tensor Network algorithms / Augustine Kshetrimayum." Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/1158525427/34.

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22

Buyskikh, Anton S. "Dynamics of quantum many-body systems with long-range interactions." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28798.

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Constantly increasing experimental possibilities with strongly correlated systems of ultracold atoms in optical lattices and trapped ions make them one of the most promising candidates for quantum simulation and quantum computation in the near future, and open new opportunities for study many-body physics. Out-of-equilibrium properties of such complex systems present truly fascinating and rich physics, which is yet to be fully understood. This thesis studies many-body dynamics of quantum systems with long-range interactions and addresses a few distinct issues. The first one is related to a gro
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23

Movassagh, Ramis. "Eigenvalues and low energy eigenvectors of quantum many-body systems." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/73370.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 211-221).<br>I first give an overview of the thesis and Matrix Product States (MPS) representation of quantum spin systems on a line with an improvement on the notation. The rest of this thesis is divided into two parts. The first part is devoted to eigenvalues of quantum many-body systems (QMBS). I introduce Isotropic Entanglement (IE) and show that the distribution of QMBS with generic interactions can be accurately obtained u
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24

Trujillo, Alba Marcela Herrera. "Quantum heat engines and energy fluctuations in many-body systems." reponame:Repositório Institucional da UFABC, 2017.

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25

Gupta, Tanul. "Novel phases in long-range interacting quantum many-body systems." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF065.

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Cette thèse explore les propriétés de l’état fondamental des systèmes bosoniques 1D fortement corrélés avec un saut à longue portée, où la cohérence quantique et les phénomènes collectifs induisent des comportements distincts de ceux des systèmes à interactions de courte portée. En utilisant des méthodes numériques avancées comme la Monte Carlo à intégrale de chemin et l’algorithme du ver, elle analyse les transitions de localisation induites par le désordre et les interactions, du superfluide à l’état non-superfluide, avec un saut décroissant selon une loi de puissance. Une découverte clé est
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26

Baumgratz, Tillmann [Verfasser]. "Efficient system identification and characterization for quantum many-body systems / Tillmann Baumgratz." Ulm : Universität Ulm. Fakultät für Naturwissenschaften, 2014. http://d-nb.info/1053381271/34.

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27

Sardharwalla, Imdad Sajjad Badruddin. "Topics in computing with quantum oracles and higher-dimensional many-body systems." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/264956.

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Since they were first envisioned, quantum computers have oft been portrayed as devices of limitless power, able to perform calculations in a mere instant that would take current computers years to determine. This is, of course, not the case. A huge amount of effort has been invested in trying to understand the limits of quantum computers---under which circumstances they outperform classical computers, how large a speed-up can be gained, and what draws the distinction between quantum and classical computing. In this Ph.D. thesis, I investigate a few intriguing properties of quantum computers in
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28

Piga, Angelo. "Entanglement and Bell correlations in strongly correlated many-body quantum systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/669100.

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During the past two decades, thanks to the mutual fertilization of the research in quantum information and condensed matter, new approaches based on purely quantum features without any classical analog turned out to be very useful in the characterization of many-body quantum systems (MBQS). A peculiar role is obviously played by the study of purely quantum correlations, manifesting in the “spooky” properties of entanglement and nonlocality (or Bell correlations), which ultimately discriminate classical from quantum regimes. It is, in fact, such kind of correlations that give rise to the pletho
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29

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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30

Endres, Manuel. "Probing correlated quantum many-body systems at the single-particle level." Diss., lmu, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-155062.

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31

Holzäpfel, Milan [Verfasser]. "Efficient estimation and verification of quantum many-body systems / Milan Holzäpfel." Ulm : Universität Ulm, 2019. http://d-nb.info/1197692851/34.

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32

Chen, Xie Ph D. Massachusetts Institute of Technology. "Many-body entanglement in gapped quantum systems : representation, classification, and application." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/79515.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 189-205).<br>Entanglement is a special form of quantum correlation that exists among quantum particles and it has been realized that surprising things can happen when a large number of particles are entangled together. For example, topological orders emerge in condensed matter systems where the constituent 1023 particles are entangled in a nontrivial way; moreover, quantum computers, which can perform certain tasks significantly fas
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33

Sünderhauf, Christoph [Verfasser], and Christian [Akademischer Betreuer] Schilling. "Chaos in many-body quantum systems / Christoph Sünderhauf ; Betreuer: Christian Schilling." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2021. http://d-nb.info/1233201212/34.

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34

Friesdorf, Mathis [Verfasser]. "Closed quantum many-body systems out of equilibrium : A quantum information perspective / Mathis Friesdorf." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1099282829/34.

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35

Schiulaz, Mauro. "Ideal quantum glass transitions: many-body localization without quenched disorder?" Doctoral thesis, SISSA, 2015. http://hdl.handle.net/20.500.11767/4908.

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In this work the role of disorder, interaction and temperature in the physics of quantum non-ergodic systems is discussed. I first review what is meant by thermalization in closed quantum systems, and how ergodicity is violated in the presence of strong disorder, due to the phenomenon of Anderson localization. I explain why localization can be stable against the addition of weak dephasing interactions, and how this leads to the very rich phenomenology associated with many-body localization. I also briefly compare localized systems with their closest classical analogue, which are glasses, and d
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36

Khan, Imran. "QUANTUM THEORY OF MANY BOSE ATOM SYSTEMS." Connect to Online Resource-OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=Toledo1195507917.

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37

Marzolino, Ugo. "Entanglement and decoherence in many-body physics." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/5827.

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2009/2010<br>The thesis deals with several features of quantum many-body systems. They are described both in terms of reversible unitary transformations and as an environment interacting with other systems. An introductory part introduces the main ideas of quantum noise and dissipative dynamics. A chapter is also dedicated to some useful aspects of entanglement. The second part of the thesis concerns the orginal results. A chapter describes the dynamics of two qubits interacting with a common environment. This chapter is focused on the derivation of a new Markovian approximation, finer than
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38

Buchhold, Michael. "Thermalization and Out-of-Equilibrium Dynamics in Open Quantum Many-Body Systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-181786.

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Thermalization, the evolution of an interacting many-body system towards a thermal Gibbs ensemble after initialization in an arbitrary non-equilibrium state, is currently a phenomenon of great interest, both in theory and experiment. As the time evolution of a quantum system is unitary, the proposed mechanism of thermalization in quantum many-body systems corresponds to the so-called eigenstate thermalization hypothesis (ETH) and the typicality of eigenstates. Although this formally solves the contradiction of thermalizing but unitary dynamics in a closed quantum many-body system, it does neit
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39

Bertini, Bruno. "Non-equilibrium dynamics of interacting many-body quantum systems in one dimension." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:1e2c50b9-73b3-4ca0-a5f3-276f967c3720.

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In this thesis we study three examples of interacting many-body systems undergoing a non equilibrium time evolution. Firstly we consider the time evolution in an integrable system: the sine-Gordon field theory in the repulsive regime. We will focus on the one point function of the semi-local vertex operator e<sup>i&beta;&phi;(x)/2</sup> on a specific class of initial states. By analytical means we show that the expectation value considered decays exponentially to zero at late times and we determine the decay time. The method employed is based on a form-factor expansion and uses the "Representa
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40

Yamaoka, Hidetaka. "Studies on stratified reduction of quantum and of classical many-body systems." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144812.

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41

Pistorius, Tim [Verfasser]. "Quantum many-body dynamics of driven-dissipative Rydberg polariton systems / Tim Pistorius." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2021. http://d-nb.info/1231433035/34.

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42

Caneva, Tommaso. "Adiabatic dynamics of many-body systems close to a quantum critical point." Doctoral thesis, SISSA, 2009. http://hdl.handle.net/20.500.11767/4142.

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43

Cevolani, Lorenzo. "Out-Of-Equilibrium Dynamics and Locality in Long-Range Many-Body Quantum Systems." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLO011/document.

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Cette thèse présente une étude des propagations des corrélations dans les systèmes avec interaction de longue portée. La dynamique des observables locales ne peut pas être décrite avec les méthodes utilisées pour la physique statistique à l’équilibre et les approches complètement nouvelles doivent être développées. Différentes bornes sur l’évolution temporelle des corrélations ont été dérivées, mais la dynamique réelle trouvée dans des données expérimentales et numériques est beaucoup plus compliquée avec différents régimes de propagation. Une approche plus spécifique est donc nécessaire pour
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44

Marahrens, Daniel. "On some nonlinear partial differential equations for classical and quantum many body systems." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/244203.

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This thesis deals with problems arising in the study of nonlinear partial differential equations arising from many-body problems. It is divided into two parts: The first part concerns the derivation of a nonlinear diffusion equation from a microscopic stochastic process. We give a new method to show that in the hydrodynamic limit, the particle densities of a one-dimensional zero range process on a periodic lattice converge to the solution of a nonlinear diffusion equation. This method allows for the first time an explicit uniform-in-time bound on the rate of convergence in the hydrodynamic lim
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45

Goldsborough, Andrew M. "Tensor networks and geometry for the modelling of disordered quantum many-body systems." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/70003/.

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Tensor networks provide a powerful and elegant approach to quantum manybody simulation. The simplest example is the density matrix renormalisation group (DMRG), which is based on the variational update of a matrix product state (MPS). It has proved to be the most accurate approach for the numerical study of strongly correlated one dimensional systems. We use DMRG to study the one dimensional disordered Bose-Hubbard model at fillings N=L = 1=2, 1 and 2 and show that the whole phase diagram for each can be successfully obtained by analysing entanglement properties alone. We �nd that the average
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46

Lao, Ka Un. "Accurate and Efficient Quantum Chemistry Calculations for Noncovalent Interactions in Many-Body Systems." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1457973344.

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47

Everest, Benjamin. "Dissipation as a resource for constrained dynamics in open many-body quantum systems." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/43375/.

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This thesis studies non-equilibrium open quantum systems where the dissipation is crucial to the achievement of novel physical regimes. We focus on atomic systems which allow for the coupling of a ground state to a Rydberg state, relying on the strong interactions between Rydberg atoms to produce the collective behaviour that we aim to investigate. For atoms in an optical lattice undergoing standard dissipation forms, e.g. loss and dephasing, we find these simple settings allow for the production of models contained in the non-equilibrium realm. We start by looking at a system with engineered
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48

Sun, Deqiang. "Landau-Zener transitions in noisy environment and many-body systems." [College Station, Tex. : Texas A&M University, 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-773.

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49

CAROLLO, FEDERICO. "Quantum fluctuations and entanglement in mesoscopic systems." Doctoral thesis, Università degli Studi di Trieste, 2016. http://hdl.handle.net/11368/2908071.

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Due to the large amount of microscopic constituents, sensible information that can be gathered about many- body systems concerns usually the behaviour of collective observables; among them, surely average observables, like the mean magnetization in quantum spin chains, but also fluctuations around mean-values. Average operators over all particles are defined with a scaling proportional to the inverse number N of considered particles; in the large N limit, the emergent collective operators form a classical algebra, with no footprints of the microscopic quantum structure they result from. On t
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50

Jin, Tony. "From noisy spin chains to quantum exclusion processes : case studies of stochastic open quantum many-body systems." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEE033.

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Cette thèse est consacrée à l’étude de systèmes quantiques étendus en interaction avec l’environnement, à la fois dans des situations à l’équilibre et hors équilibre. L’approche adoptée est celle des processus stochastiques quantiques. On s’intéresse dans un premier temps à ce qu’il advient des modèles dits de chaîne de spin lorsque ceux-ci sont mis en contact avec un environnement extérieur qui provoque un déphasage aléatoire local des spins. Il est montré que dans la limite de bruit fort et de temps long, une dynamique purement diffusive émerge. Le modèle effectif décrivant cette limite s’in
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