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 26 for “"quantum bits"”.
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Revisiting physics of quantum bits
Advancements in the technology of quantum bits invoke more precise calculations for decoherence and dissipative effects. In this thesis, the physics of truncated two level systems is revisited and it is shown that in some systems, such as in triple-junction superconducting flux qubit, environmental …
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Chemical Control of the Spin-Phonon Interaction to Develop a New Generation of Molecular Quantum Bits
… of new technologies such as molecular quantum bits and quantum memories. Implementing these materials is fundamentally limited by the rapid decay of populations of electronic spins back to magnetic equilibrium. Because of the small energy scale of paramagnetic interactions, the time a …
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Coherent photons from a solid-state artificial atom
Single spins confined in semiconductor quantum dots - artificial atoms in the solid-state - are attractive candidates for quantum mechanical bits, the fundamental units and building blocks of a quantum computer. The ability to address quantum dot spins optically allows us to initialise and …
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Tangled Circuits: Characterizing Errors in Experimental Superconducting Quantum Processors
… towards the first generation of error-corrected quantum computers based on physical quantum bits (qubits), researchers require robust techniques for designing, operating, and characterizing coupled multi-qubit systems in the laboratory, and for understanding the errors which arise in such …
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Quantum Computation in Ultra-thin Topological Insulator Films
In the past several decades quantum computation has become a rapidly developing research area. The properties particular to quantum systems such as superposition of quantum states, wave function collapse, and quantum entanglement have shone a path to a type of ultra-high-speed and powerful …
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Design and Experimental Demonstration of a Scalable Acoustic Analogue of Quantum Computers
… the way we live, work, and innovate. While Quantum computers based on quantum bits (qubits) exploit principles such as superposition and entanglement to offer unprecedented computational power compared to conventional computers. However, their scalability and practical realization are …
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Protocols and Devices for Scalable Spin-Photon Quantum Networks
One of the central goals in quantum information science is constructing a quantum network useful for quantum communication, sensing, and computation. Its realization crucially depends on efficient distribution of entanglement. A promising approach entails connecting quantum nodes via photons, which …
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A general-purpose pulse sequencer for quantum computing
Quantum mechanics presents a more general and potentially more powerful model of computation than classical systems. Quantum bits have many physically different representations which nonetheless share a common need for modulating pulses of electromagnetic waves. This thesis presents the design and …
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Molecular color centers
… enables bottom-up structural control over quantum bits, or qubits, for quantum information science. While molecular platforms may be used to create bespoke qubits for applications from nanoscale sensing to secure communication, such systems generally lack ground state spins capable of …
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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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Scalable trap technology for quantum computing with ions
Quantum computers employ quantum mechanical effects, such as superposition and entanglement, to process information in a distinctive way, with advantages for simulation and for new, and in some cases more-efficient algorithms. A quantum bit is a two-level quantum system, such as the electronic or …
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Microstrip Superconducting Quantum Interference Devices for Quantum Information Science
<p>Quantum-limited amplification in the microwave frequency range is of both practical and fundamental importance. The weak signals corresponding to single microwave photons require substantial amplification to resolve. When probing quantum excitations of the electromagnetic field, the substantial …
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Epitaxial Aluminum Oxide Thin Films on Niobium (110): A Study of Their Growth and Their Use in Superconducting Tunnel-Junctions
… charge fluctuations in Josephson junction-based quantum bits. Amorphous tunnel-barriers have large numbers of two-level fluctuators that can couple to the quantum states in the device. Single-crystal tunnel-barriers on the other hand show a reduced density of these two-level fluctuators. For my …
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A parallel environment for simulating quantum computation
… and implementation of an environment to allow quantum computation to be simulated on classical computers. Although it is believed that quantum computers cannot in general be efficiently simulated classically, it is nevertheless possible to simulate small but interesting systems, on the order of …
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Feasibility studies for quantum computation with spectral hole burning media
In this thesis I consider a scheme for quantum computation in which quantum bits (qubits) are stored in individual spectral holes of an in homogeneously broadened medium, such as a cryogenically cooled crystal of Pr:Y2 SiO 3 . Qubits are transferred between spectral holes by virtue of mutual …
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One- and two-qubit operations in Si-MOS quantum dots
Quantum computers have potential to solve hard problems that even the most advanced supercomputers are not capable of, such as prime factoring, database search, and quantum simulation. Quantum bits, or qubits, made from silicon quantum dots is one scalable approach that can be used to realize a …
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Quantum-confined excitons in 2-dimensional materials
… potential of these materials as a platform for quantum devices: develop a method by which we can deterministically create single-photon emitting sites in 2d-TMDs, in large-scale arrays. These we call quantum dots (QDs): quantum confinement potentials within semiconductor materials which can trap …
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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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Epitaxial aluminium gates in ultra-shallow GaAs/AlxGa1-xAs heterostructures for low disorder nanoelectronics
… we turn to investigating these systems for quantum electronic devices. We fabricate quantum point contacts and evidence the compatibility of these all-epitaxial systems with quantum device fabrication by demonstrating robust and reproducible 1D quantisation. Secondly, we show extremely low …
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On the Dynamics of Single-Electron Tunneling in Semiconductor Quantum Dots under Microwave Radiation
… of single-electron tunneling and to realize quantum bits (qubits) in semiconductor quantum dots. At low temperatures, confined single quantum dots and double quantum dots are realized in the twodimensional electron gas (2DEG) of AlGaAs/GaAs heterostructures. For transport studies, quantum …
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