Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 83 for “"quantum many-body"”.
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Quasiparticles in Quantum Many-Body Systems
… with the remarkable experiment of the fractional quantum Hall effect and are drawing a lot of recognition. Realization of these phases on lattice systems and study of the anyon quasiparticles there are important and interesting avenue to research in unraveling new physics, which can not be found …
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Inverse methods in quantum many-body physics
"The interactions of many quantum particles can give rise to fascinating emergent behavior and exotic phases of matter with no classical analogues. Examples include phases with topological properties, which can occur at low temperatures in frustrated magnets and certain superconductors, and …
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Quantum Stochastic Processes and Quantum Many-Body Physics
This dissertation investigates the theory of quantum stochastic processes and its applications in quantum many-body physics. The main goal is to analyse complexity-theoretic aspects of both static and dynamic properties of physical systems modelled by quantum stochastic processes. The thesis …
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Algorithms for Gibbs states of quantum many-body systems
We consider the many-body problem in quantum mechanics from a computational perspective. While physical problems like the time-evolution of a quantum system or its ground and thermal states have simple closed-form expressions, these formulas become intractable for multipartite systems. Even for a …
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Quantum many-body physics with classical and quantum algorithms
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01
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Quantum many body physics in single and bilayer graphene
… a uniquely promising avenue for investigation of many body physics. Graphene constitutes a new and unusual 2DES, which may give rise to unexpected collective phenomena. However, the vanishing density of states in charge neutral single layer graphene suppresses many body effects, and one has to …
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Efficiently Learning, Testing, and Simulating Quantum Many-Body Systems
This thesis focuses on quantum information and quantum computing, and their applications in studying quantum many-body systems. A remarkable interplay between computer science and quantum physics in the past few decades has revealed that a precise control and manipulation of interacting quantum …
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Symmetry and its Signatures in Quantum Many-Body Dynamics
… feature in our understanding of statistical or manybody systems. By making appeals to universal properties associated with global symmetries and topology, one may describe universal properties of “typical” states and dynamics in equilibrium, even when keeping track of the precise dynamics of a …
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Dynamics of quantum many-body systems with long-range interactions
… 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 …
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Topics in quantum information theory and quantum many-body physics
… two results relating to the intersection between quantum information theory and quantum many-body physics. The first pertains to quantum algorithms, where few computational problems are believed to exhibit exponential separation between quantum and classical performance. For those that are, …
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Chaos and Thermalization in Quantum Many-Body Systems and Gravity
… explore the process of thermalization in chaotic quantum many-body systems with the help of concepts and techniques from quantum information theory. We identify a universal dynamical process in the Heisenberg evolution of operators known as void formation, and use it to provide a new …
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Eigenvalues and low energy eigenvectors of quantum many-body systems
… 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 …
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On some nonlinear partial differential equations for classical and quantum many body systems
… 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 …
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Quantum many-body physics of ultracold molecules in optical lattices: models and simulation methods
Includes bibliographical references.
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Combinatorial algorithms for perturbation theory and application on quantum computing
<p>Quantum computing is an emerging area between computer science and physics. Numerous problems in quantum computing involve quantum many-body interactions. This dissertation concerns the problem of simulating arbitrary quantum many-body interactions using realistic two-body interactions. To …
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Field theoretical methods for strongly correlated electron systems
… as a powerful computational tool to study quantum many-body systems. They have been applied successfully to the study of various systems of strongly correlated electrons in condensed matter physics, particularly to problems where a non-perturbative treatment is required.
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TOWARDS ULTRACOLD FERMIONS IN 2D DISORDERED OPTICAL LATTICES
Quantum simulation with ultracold atoms offers unparalleled control for studying complex many body phenomena, yet scalable platforms for disordered systems remain challenging. This work presents the development of an experimental platform to investigate quantum many-body physics with ultracold …
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