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 16 of 16 for “"Many-Body Quantum Systems"”.
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Advancements in the Path Integral Monte Carlo Method for Many -Body Quantum Systems at Finite Temperature
After describing these advancements in methodology, we apply our new technology to fluid sodium near its liquid-vapor critical point. In particular, we explore the microscopic mechanisms which drive the continuous change from a dense metallic liquid to an expanded insulating vapor above the …
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Advancements in the Path Integral Monte Carlo Method for Many-Body Quantum Systems at Finite Temperature
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Quantum simulations with 8̳8̳Sr+̳ ions on planar lattice traps
Quantum simulations are the use of well controlled many-body quantum systems to simulate and solve other many-body quantum systems that are not understood. This thesis describes theoretical proposals and experimental progress towards simulating quantum spin Hamiltonians with trapped SSSr+ ions on …
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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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Features and Applications of Random Unitaries
… model plays essential roles in the study of many-body quantum systems, and have many applications in the field of quantum information. In this thesis we will explore some features and applications of this model. We will first study the scrambling property of random circuits (i.e., sequential …
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Quantum Monte Carlo studies of dense hydrogen and two-dimensional Bose liquids
Quantum Monte Carlo techniques; in their various incarnations, calculate ground state or finite temperature properties of many-body quantum systems. We apply the path-integral Monte Carlo method to hydrogen at densities and temperatures in the regime of cooperative thermal and pressure …
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A single-site resolution fermionic quantum-gas microscope
Quantum-gas microscopes have become an important tool in quantum simulation as they enable direct probing of local quantities by single-atom-resolved detection in optical lattices. Recent years have seen many fascinating results from the bosonic quantum-gas microscopes using 87Rb. However, no such …
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Cluster Dynamical Mean-Field Theory: Applications to High-Tc Cuprates and to Quantum Chemistry
… study problems in strongly correlated electron systems, including high-Tc cuprate superconductors as well as a few quantum chemical reference systems. We start with an introduction to the background of the interacting electron systems, followed by a brief description on the current understanding …
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Quantum chaos and phase transitions
Quantum materials permeate the modern world - these are systems that exhibit quantum mechanical properties, like topological phases and superconductivity, at macroscopic scales. The principles governing quantum materials include entanglement and coherence -phenomena which are fundamentally quantum …
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Aspects of symmetry, topology and anomalies in quantum matter
To understand the new physics and richness of quantum many-body system phenomena is one of the stimuli driving the condensed matter community forward. Importantly, the new insights and solutions for condensed matter theory sometimes come from the developed and developing knowledge of high energy …
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The Trainability and Expressivity of Quantum Machine Learning Models
… more and more evidence that precise control of many-body quantum systems yields a method of computation more powerful than what is achievable using conventional models of computation. This culminated in recent years with experimental demonstrations on quantum devices of computational tasks on …
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Control, gates, and error suppression with Hamiltonians in quantum computation
… perform simulation, and implement logic gates in quantum computation within the context of using Hamiltonian controls. We also study the complexity class QMA-complete. We first investigate a method (introduced by Jordan, Farhi, and Shor) for suppressing environmentally induced errors in …
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Dynamical Aspects of Topological Quantum Systems
… entanglement encoded within the ground states of many-body quantum systems. In this thesis, we discuss how novel phenomena associated with topological phases can arise in systems that are driven out of equilibrium or coupled to their surroundings, which are not described by ground state physics. …
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Locally Tuneable Quantum Hamiltonians with Neutral Atoms in Optical Lattices
… in optical lattices are powerful and versatile quantum simulators of quantum lattice models with many applications. While they have successfully realised many translationally invariant models, the ability to locally tune all local Hamiltonian parameters remains an outstanding goal that would …
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Exotic vortices in superfluids and matrix product states for quantum optimization and machine learning
… dissertation we study vortices in two different systems: a rotating, Rabi-coupled, two-component Bose--Einstein condensate (BEC) and a rotating spinor-BEC, in two spatial dimensions. Vortex molecules can form in a two-component superfluid when a Rabi field drives transitions between the two …
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Many-body localization and tensor networks
This thesis is focused on many-body localization (MBL) and the development of algorithms using the tensor networks representation for many-body localized systems. Chapter 1 is a detailed discussion on the MBL phenomenon. Chapter 2 gives an introduction to the numerical techniques that are …