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 33 for “"Quantum circuit"”.
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Quantum circuit analysis using analytic functions
… computation is first introduced. Finite quantum systems are considered with D-dimensional Hilbert space, and position x and momentum p taking values in Z(D) (the integers modulo D). An analytic rep resentation of finite quantum systems that use Theta function is presented and considered. …
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Optimizing Quantum Circuit Layout using Quantum Annealing
Quantum computing has garnered significant interest due to its theoretical potential for exponential speedup in computations. This advantage arises from the unique properties of quantum mechanics, which enable quantum bits (qubits) to exist in multiple states simultaneously and to become entangled. …
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A Photonic Quantum Sensor
This thesis characterizes a quantum node comprising an atom and a microresonator. The electric field of the microresonator is simulated using the finite element method. An approximating analytical solution of the microresonator is proposed and compared to the finite element method simulation. …
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From TPU to QPU: Bridging Fidelity Gaps Across Next-Generation Computing Systems
… such as Tensor Processing Units (TPUs) and quantum computing systems utilizing Quantum Processing Units (QPUs) stand out as trans-formative technologies. Despite their potential, these systems share significant challenges related to hardware infidelity, manifested as error-induced …
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Disorder-driven phase transitions in weak, boundary-obstructed, and non-Hermitian topological insulators
"This thesis focuses on three main areas in quantum physics. The bulk of this thesis addresses the effects of disorder on novel classes of topological insulators. Topological insulators are states of matter that display properties (most notably, protected anomalous edge states) that are robust to …
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Scalable Quantum Compilation Approaches For Reliable Quantum Computing
<p>Quantum computing has the potential to revolutionize various industries, from pharmaceuticals to finance and transportation. Unlike classical computers, quantum computers are based on the principles of quantum mechanics and can perform specific calculations exponentially faster than classical …
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Space-Efficient and Noise-Robust Quantum Factoring
We provide two improvements to Regev's quantum factoring algorithm (arXiv:2308.06572), addressing its space efficiency and its noise-tolerance. Our first contribution is to improve the quantum space efficiency of Regev's algorithm while keeping the circuit size the same. Our main result constructs …
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CHAOS, holography, and other science
… holes in holography, chaos in strongly-coupled quantum systems, and the computational complexity of holographic states. By directly considering the time evolution of local operators, I am led to a simple diagnostic of many-body chaos: a commutator of such operators separated in time and space. …
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Electromagnetically Induced Transparency and electron spin dynamics using superconducting quantum circuits
… is an exploration on superconducting devices, quantum optics, and magnetic resonance. Superconductive quantum circuits (SQC) comprising mesoscopic Josephson junctions can exhibit quantum coherence amongst their macroscopically large degrees of freedom. They feature quantized flux and/or charge …
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STUDIES IN QUANTUM CONTROL AND QUANTUM INFORMATION
This thesis translates abstract concepts from quantum information theory into physical control protocols designed for cooling, error recovery, and quantum metrology. The physical platforms utilized in this work include qubits, quantum harmonic oscillators, and their composite systems. In the first …
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Distributed Simulation Methods and Algorithms for Superconducting Quantum Computer Reliability
Superconducting quantum computers are yet to reach the fault-tolerant regime, and thus the tantalising promises behind quantum algorithms are laid barren. To cross this knowledge-concealing wasteland, one must first understand how both intrinsic and extrinsic noise hinders the reliability of …
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Approximating a wavelet kernel using a quantum computer
Machine learning and quantum computing are both fields which have gained a significant amount of popularity and attention in recent years. The intersection of these two fields, quantum machine learning, looks at whether quantum computers can aid or improve classical machine learning methods, or …
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Quantum computation beyond the circuit model
The quantum circuit model is the most widely used model of quantum computation. It provides both a framework for formulating quantum algorithms and an architecture for the physical construction of quantum computers. However, several other models of quantum computation exist which provide useful …
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Digital Quantum Computing for Many-Body Simulations
Abstract Iris The power of quantum computing lies in its ability to perform certain calculations and solve complex problems exponentially faster than classical computers. This potential has profound implications for a wide range of fields, including particle physics. This thesis lays a fundamental …
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Complexity And Entanglement In Quantum Gravity
… a collection of recent results concerning quantum information theory applied to quantum gravity. We first study the entanglement structure of Euclidean path integral states in SU(2) Chern-Simons theory, where we elucidate a connection between topological entanglement and quantum mechanical …
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Enhancing Fidelity through Gate Decomposition: A Strategy to Mitigate Quantum Crosstalk on NISQ Computers
<p>Quantum computing aims to tackle computationally intricate problems that are infeasible for classical computers. However, as quantum processors improve in scaling their sizes, their complexity also increases. Due to this complexity, there is a significant detrimental effect of quantum noise …
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Applications of coherent classical communication and the Schur transform to quantum information theory
Quantum mechanics has led not only to new physical theories, but also a new understanding of information and computation. Quantum information not only yields new methods for achieving classical tasks such as factoring and key distribution but also suggests a completely new set of quantum problems, …
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Electronic properties of nano and molecular quantum devices
… main results of this thesis are as follows: A quantum circuit rule for combining quantum interference effects in the conductive properties of oligo(phenyleneethynylene) (OPE)-type molecules possessing three aromatic rings was investigated both theoretically and experimentally. Molecules were of …
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TENSOR NETWORKS FOR OPEN QUANTUM SYSTEMS
Is it possible to efficiently simulate a quantum physical system on a classical computer? The computational resources needed to manipulate quantum many-body states typically scale exponentially in the number of their constituents, making the simulation very difficult or outright impossible even at …
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