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 67 for “"Quantum Devices"”.
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Telecom Wavelength Quantum Devices
Semiconductor quantum dots (QDs) are well established as sub-Poissonian sources of entangled photon pairs. To improve the utility of a QD light source, it would be advantageous to extend their emission further into the near infrared, into the low absorption wavelength windows utilised in long-haul …
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Hybrid Two Dimensional Quantum Devices
… is a thick oxide layer (50 nm) but the devices described here are able to achieve full supercurrent tunability, and comparable quality, with only a 5 nm thick layer of mechanically exfoliated 2D hexagonal boron nitride. The second set of measurements are on a superconductor/semiconductor …
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Nonlinear Periodic Structures: From Classical to Quantum Devices
… and their applications in both classical and quantum regime are investigated. New theoretical models are developed, and novel applications of nonlinear periodic structures are proposed and demonstrated. The theoretical studies, both design and simulation, are based on but not limited to …
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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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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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Design, fabrication, and characterization of low-dimensional quantum devices
… growth techniques has led to novel high-speed devices such as modulation-doped field effect transistors and quantum well lasers. High resolution lithography and pattern transfer techniques now make it possible to further restrict the electronic motion to lower dimensions. A variety of …
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Computation in models inspired by near-term quantum devices
The race is on to build the first quantum computer, and although there are many groups working towards this goal, their quantum devices have certain architectural properties in common. First, the devices tend to be built on qubits arranged in a 2D grid, with gates between neighboring qubits. …
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Nanoscale engineering of spin-based quantum devices in diamond
The development of quantum technologies from the bottom-up requires engineering and control at the level of single quanta. In this thesis, we explore the engineering of a particular quantum system: optically active defects in diamond, known as color centers. Color centers have a variety of …
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Investigation of lateral gated quantum devices in Si/SiGe heterostructures
Quantum dots in Si/SiGe have long spin decoherence times, due to the low density of nuclear spins and weak coupling between nuclear and electronic spins. Because of this, they are excellent candidates for use as solid state qubits. The initial approach towards creating controllable Si/SiGe quantum …
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TOWARDS QUANTUM ADVANTAGE AND CERTIFICATION WITH NOISY INTERMEDIATE-SCALE QUANTUM DEVICES
The second quantum revolution’s success critically depends on the practical applications of the noisy intermediate-scale quantum devices. Despite the hope rendered by the experimental demonstration of “quantum supremacy”, the essential question regarding how to translate such breakthroughs into …
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Theory of electron and phonon transport in nano and molecular quantum devices : design strategies for molecular electronics and thermoelectricity
… electronic building blocks, thermoelectric devices and sensors. In this thesis, after a discussion about the theoretical methods used to model electron and phonon transport through the nanoscale junctions, I cover four main results in the areas of molecular sensing, new graphene-based …
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OPEN-SOURCE MIDDLEWARE FOR QUANTUM COMPUTING
Quantum computing has the potential to greatly surpass classical computing for specific tasks. Despite the noise challenges in current quantum devices, NISQ (Noisy Intermediate-Scale Quantum) devices are becoming more accessible to research groups and institutions. To successfully deploy quantum …
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Numerical analysis for quantum electrodynamics in the ultrastrong coupling regime
In the race towards achieving true quantum advantage, the development of a scalable and reliable quantum computer demands lower gate error rates, longer qubit coherence times, increased qubit connectivity, and enhanced controllability of qubit couplings. Addressing these challenges necessitates …
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The space around BQP
This thesis explores the computational power of quantum devices from the perspective of computational complexity theory. Quantum computers hold the promise of solving many problems exponentially faster than classical computers. The computational power of universal quantum devices is captured by 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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Non-Gaussian noise spectroscopy with superconducting qubits
Most quantum control and quantum error-correction protocols assume that the noise causing decoherence is described by Gaussian statistics. However, the Gaussianity assumption breaks down when the quantum system is strongly coupled to a sparse environment or has a non-linear response to external …
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Digital noise reconstruction with a quantum sensor
Interactions between a quantum system and its environment are usually inevitable and could lead to decoherence limiting the performance of quantum devices. On the one hand, to build robust quantum devices requires an in-depth characterization of such decoherence mechanism. On the other hand, the …
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A Vertically Loaded Diamond Microdisk Resonator (VLDMoRt) towards a Scalable Quantum Networks
… for increasing the efficiency and scalability of quantum devices based on diamond quantum emitters.
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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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TOWARDS ACCELERATION OF QUANTUM-CLASSICAL ORCHESTRATION
Quantum computing is expected to act as a hardware accelerator within future computing infrastructures, complementing classical processors in the same way GPUs accelerate specific workloads today. While algorithms such as Shor’s and Grover’s suggest potential advantages, the practical use of …
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