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.
Results
Showing 1 to 20 of 74 for “"many body systems"”.
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Quasiparticles in Quantum Many-Body Systems
… 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 in the continuum, and this thesis is an important contribution in that direction. Also such …
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Normal and superconducting many-body systems
"This thesis consists of three Chapters. In the first Chapter, based on a planar unconventional Fermi liquid model, we present several results on the optimally doped and overdoped cuprate superconductors. For the normal state, we have analytically derived a linear in temperature and energy …
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Applying AdS/CFT to many body systems
In this thesis, we model a many body system by a conformal field theory, and calculate the correlation function of a scalar operator in this theory using the AdS/CFT correspondence. We describe numerical techniques for calculating the retarded Green function of the operator. The results suggest …
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AB-INITIO DYNAMICS IN STRONGLY INTERACTING MANY-BODY SYSTEMS
Understanding strongly interacting quantum many-body systems remains a key problem in modern physics due to the quantum correlations they develop, which result in highly nontrivial macroscopic phenomena which still defy our efforts of a thorough theoretical understanding, like quantum phase …
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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 Simulation of Many-body Systems with Superconducting Qubits
The study of interacting many-body quantum systems is central to the understanding of wide a range of physical phenomena in condensed-matter systems, quantum gravity, and quantum circuits. However, quantum systems are often hard to study analytically, and the classical computing resources required …
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Efficiently Learning, Testing, and Simulating Quantum Many-Body Systems
… 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 systems enables us to process information and perform …
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Dynamics of quantum many-body systems with long-range interactions
… 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. …
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Chaos and Thermalization in Quantum Many-Body Systems and Gravity
… 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 characterization of …
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Eigenvalues and low energy eigenvectors of quantum many-body systems
… 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 …
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Quantum Algorithms and Non-Equilibrium Dynamics in Many-Body Systems
Understanding the physical features of quantum many-body systems is a challenging endeavor spanning across multiple branches of physics. In this thesis, we explore the properties of one- and two-dimensional quantum systems in the context of quantum algorithms and non-equilibrium dynamics. In the …
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Topology, localization, and spontaneous symmetry breaking in nonequilibrium many-body systems
Exotic many-body phenomena are usually associated with the ground state of a time-independent Hamiltonian. It is natural to ask whether these physics can survive in a dynamic setting. Under a generic drive, the steady equilibrium state is most likely an infinite-temperature featureless thermal …
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Topics in Computing with Quantum Oracles and Higher-Dimensional Many-Body Systems
… limited in some way, often requiring ancilla systems, working only for restricted sets of operators, or simply being too inefficient. We develop a novel procedure without these limitations, and show how it can be applied to lift a requirement of the Solovay-Kitaev theorem, a landmark theorem …
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Interrogating the void : the difficulty of extracting information from many-body systems
… the information-theoretic properties of quantum many-body systems can be analyzed. I do this in two different settings. First, I will describe an approach to the "scrambling time problem," a conjecture of Susskind and Sekino that asserts that black holes can thermalize the information of objects …
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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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Ground state and dynamical properties of many-body systems by non conventional Quantum Monte Carlo algorithms
… state and dynamical properties of interacting many-body systems. We then apply these techniques to the study of excitations in superfluid He4 and to explore the structure of nuclear systems using chiral effective field theory interactions.
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