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 29 for “"quantum gates"”.
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Implementing Quantum Gates With Length-3 Dynamic Graphs
The continuous-time quantum walk is a quantum version of a random walk that evolves by Schrodinger's equation. With the Hamiltonian equal to the adjacency matrix of a sequence of graphs, called a dynamic graph, continuous-time quantum walks have been shown to implement quantum gates, including the …
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Quantum gates, sensors, and systems with trapped ions
Quantum information science promises a host of new and useful applications in communication, simulation, and computational algorithms. Trapped atomic ions are one of the leading physical systems with potential to implement a large-scale quantum information system, but many challenges still remain. …
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Optimal control and speed limits of two-qubit quantum gates
The speed of elementary quantum gates, especially two-qubit gates, sets a fundamental limit on how fast a quantum computer can run. For current quantum computers that are subject to noise and errors, the speed of quantum gates is even more important as qubits have finite coherence times, and faster …
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High fidelity quantum gates with ions in cryogenic microfabricated ion traps
While quantum information processing offers a tantalizing possibility of a significant speedup in execution of certain algorithms, as well as enabling previously unmanageable simulations of large quantum systems, it remains extremely difficult to realize experimentally. Recently, fundamental …
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Applications of single-photon two-qubit quantum logic to the quantum information science
… this thesis, I describe demonstration of various quantum information processing tasks using single-photon two-qubit (SPTQ) quantum logic. As an initial state of those tasks, I used various entangled photon pairs, and I describe development of a polarization entangled photon pair source based on a …
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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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Majorana-based Topological Quantum Algorithms in Magnet-Superconductor Hybrid Structures
… ingredient for the realization of fault-tolerant quantum computing and topologically protected quantum devices. Magnet-superconductor hybrid (MSH) systems have proven to be an experimentally versatile platform for quantum engineering the emergence of topological superconductivity and the …
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Logical and algebraic structures from Quantum Computation
… open problems regarding the axiomatisation of quantum computational logics. This thesis will be structured as follows: in Chapter 2 we will review some basics of universal algebra and functional analysis. In Chapters 3 through 6 the fundamentals of quantum gate theory will be produced. In …
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Twist: Sound Reasoning for Purity and Entanglement in Quantum Programs
Quantum programming languages enable developers to implement algorithms for quantum computers that promise computational breakthroughs in classically intractable tasks. Programming quantum computers requires awareness of entanglement, the phenomenon in which measurement outcomes of qubits are …
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Features and Applications of Random Unitaries
… 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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Optimal Quaternary Hermitian Linear Complementary Dual Codes for Entanglement-Assisted Quantum Error Correction
… codes and import them into entanglement-assisted quantum codes. The thesis begins by introducing classical error correction, followed by a detailed introduction to quantum computing. Topics that are discussed in the introduction include qubits, quantum phenomena, such as superposition and …
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Quantum Optics and Quantum Information Processing in Rare-Earth-Ion-Doped Crystals
… rare-earth-ion-doped crystals in the fields of quantum optics and quantum information processing are addressed. The experiments and theoretical considerations referred to in this thesis are based on the coherent transient interaction between light and the ions in the crystals. A photon echo …
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Quantum signal processing by single-qubit dynamics
Quantum computation is the most powerful realizable model of computation, and is uniquely positioned to solve specialized problems intractable to classical computers. This quantum advantage arises from directly exploiting the strangeness of quantum mechanics that is fundamental to reality. As such, …
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Programmable photonics for quantum and classical information processing
… application of integrated photonic systems to quantum information processing as well as quantum and classical communications. The common thread throughout this work is the efficacy of variational numerical optimization in the design and optimization of photonic/bosonic systems. I present the …
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THE EFFECT OF THE ANCILLA VERIFICATION ON THE QUANTUM ERROR CORRECTION
… the receiver decodes the information. Quantum error correction is used in quantum computing to protect quantum information from errors due to decoherence and other quantum noise. Quantum error correction is essential if one is to achieve fault-tolerant quantum computation that can deal …
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Quantum State Estimation and Tracking for Superconducting Processors Using Machine Learning
<p>Quantum technology has been rapidly growing; in particular, the experiments that have been performed with superconducting qubits and circuit QED have allowed us to explore the light-matter interaction at its most fundamental level. The study of coherent dynamics between two-level systems and …
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A type-based framework for higher-order quantum theory
The study of quantum information protocols that process quantum gates has led to an interest in ‘higher-order’ quantum transformations, which are transformations that act on other quantum transformations as inputs and/or return them as outputs. Mathematically, such transformations form an inductive …
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Control, gates, and error suppression with Hamiltonians in quantum computation
… errors, 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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Steepest-Entropy-Ascent Quantum Thermodynamic Modeling of Quantum Information and Quantum Computing Systems
Quantum information and quantum computing (QIQC) systems, relying on the phenomena of superposition and entanglement, offer the potential for vast improvements in certain computations. A practical QC realization requires maintaining the stored information for time-scales long enough to implement …
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Dinamica effettiva di sistemi quantistici driven chiusi e aperti
… years, the enormous progress in the field of Quantum Technologies has allowed the development of tools capable of creating and controlling quantum states in physical systems, called NISQ (Noisy Intermediate-Scale Quantum) computers. They constitute an important intermediate stage towards the …
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