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 21 for “"Quantum Device"”.
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Experimental Demonstration of Lindblad Tomography on a Superconducting Quantum Device
Information loss in experimental quantum devices is traditionally characterized using metrics such as T₁ and T₂, which are readily accessible from standard time-domain measurement. While T₁ and T₂ times provide rough heuristics for interaction between single qubits and their lossy environments, …
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Cryogenic characterization of Josephson junctions
… of understanding the behavior of low-temperature quantum electronics. Reliable device testing provides the feedback to fabrication process development, facilitating the rapid development of quantum devices. The research presented in this thesis explores the cryogenic testing, analysis, and …
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Multi-terminal Josephson effect
… a Josephson junction is an ubiquitous quantum device formed by a weak link between a pair of superconductors. In this work, we demonstrate the dc Josephson effect in mesoscopic junctions of more than two superconducting terminals. We report fabrication and characterization of the 3- and …
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Disordered systems and quantum algorithms: from spin glasses to neural networks
This thesis investigates how quantum algorithms can solve disordered systems, with a focus on spin glasses and neural networks. We first introduce several examples of disordered systems and have an overview of spin glasses. Then we introduce a cyclic quantum annealing protocol on D-Wave’s …
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Growth of titanium-nitride thin films for low-loss superconducting quantum circuits
… beam epitaxy (MBE) for applications in low loss quantum circuits. Titanium nitride is a material known to have low loss at microwave frequencies which sees practical use in many emerging quantum device architectures. The goal of this research is to investigate improvements in TiN thin films …
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Learning Theoretic Foundations for Understanding Quantum Systems
Understanding and harnessing the power of quantum systems has the potential to transform many domains in science and technology. However, before we can achieve these aspirations, we must first build a better understanding of how quantum systems fundamentally behave. In this thesis, we approach this …
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Statistical metrology and process control of quantum devices
Quantum emitters, such as color centers (e.g., nitrogen-vacancy color centers in diamond), have a wide range of applications in quantum information processing, bioimaging, and quantum sensing. Such quantum emitters are typically addressed optically and store their quantum state as an electron spin …
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Vector magnetometry using cavity-enhanced microwave readout of solid-state spin sensors
Robust, high-fidelity readout is central to quantum device performance. Overcoming poor readout is therefore an increasingly urgent challenge for devices based on solid-state spin defects, particularly given their rapid adoption in quantum sensing, quantum information, and tests of fundamental …
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Noise resilience of proofs of quantumness
Achieving quantum computational advantage requires solving a conjectured classically intractable problem on a quantum device. A proof of quantumness is a type of challenge-response protocol inspired by cryptographic protocols in which a classical verifier can certify the quantum advantage of an …
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Modeling of photocurrent spectra induced by nonlinear absorption in high-indium-content iii-nitride disk-in-wire photodiode
Research on semiconductor quantum structures has raised many interesting questions about fundamental physics and potential applications in many fields. By utilizing the physical properties induced by quantum structure in semiconductors, which depend on the dimension of the systems, one can gain …
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Dynamical aspects of quantum information and classical simulability
Quantum many-body dynamics describes how systems of interacting particles evolve, often giving rise to collective phenomena with no classical counterpart. Understanding these dynamical phases of matter is believed to be typically hard. To simulate such dynamics, we need to either emulate it on a …
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The Trainability and Expressivity of Quantum Machine Learning Models
… 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 the verge of …
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Machine-Aware Enhancing of Quantum Computers
The realization of a computer that exploits quantum - rather than classical - principles represents a formidable scientific and technological challenge. Today, superconducting quantum processors are achieving significant results in simulation and computation capabilities. However, the realization …
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Epitaxial aluminium gates in ultra-shallow GaAs/AlxGa1-xAs heterostructures for low disorder nanoelectronics
… partake in the unending pursuit to reduce device size in order to minimise energy consumption and maximise operation temperature. Device reduction entails decreasing the depth of the conduction channel below the wafer surface, but increased scattering from charge trapped in oxides at the …
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Accelerating Learning of Quantum Systems using Prior Information
Towards realizing practically useful quantum devices, the sizes of quantum devices are being scaled up. An imminent challenge to scalability is ensuring resource requirements of learning tasks that occur as part of device characterization and execution of quantum algorithms also scale favorably. …
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Entangled protocols and non-local games for testing quantum systems.
The field of quantum computing investigates the extent to which one can design a quantum system that outperforms all known classical hardware at a certain task. But, to what extent can a human being, capable only (perhaps) of classical computation and of observing classical bit-string messages, …
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Engineering superconductivity in ballistic semiconductor nanowires
… are promising materials for studying novel quantum devices. Following proposals to use 1D nanostructure to realize Majorana zero modes, quasiparticles that are relevant for topological quantum computing, many groups have attempted to engineer these modes in hybrid …
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Discrimination of Quantum Channels
… and error rates for the task of binary quantum channel discrimination, where the main focus lies on proving optimal asymmetric error exponents (both asymptotically and non-asymptotically) for different variants of this problem. The task of binary quantum channel discrimination is to …
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Developing Small-scale Quantum Information Processors based on Electronic Spins in Diamond
… have demonstrated good properties as qubits for quantum information tasks. However, engineering larger quantum registers around a central NV enables more powerful applications. For example, a register of nuclear spins around the NV has already demonstrated many quantum protocols such as quantum …
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Silicon Nanoelectronics for Quantum Metrology Standard and Cryogenic SBMOSFET
The nanoscale silicon electronic devices are the fundamental building blocks for the modern integrated circuitry that powers the personal computer, smart phone, advanced car sensor or biomedical implant. Besides these great contributions to our daily life, they also provide excellent host …
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