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 43 for “"superconducting qubits"”.
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Engineering Noise-Protected Superconducting Qubits
Improving the lifetime of qubits is crucial to achieve reliable quantum computation with superconducting qubits. One way to improve the qubit lifetime is to engineer the circuit design and the parameters to protect the qubit from environmental noise. Some of the noise-protected superconducting …
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Waveguide Quantum Electrodynamics with Superconducting Qubits
… of a waveguide QED architecture by coupling superconducting artificial atoms, typically operated as qubits, to one-dimensional transmission lines. We first demonstrate that superconducting qubits in a waveguide QED system can be used as high-quality quantum emitters. We then leverage the …
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Waveguide quantum electrodynamics with superconducting qubits
… the field of microwave quantum optics using superconducting circuits has gained a tremendous amount of attention. In particular, the confinement of photonic modes to 1D enables a new parameter regime of strong interactions between qubits and open waveguides. In these setups, known as …
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Simulation algorithms, Floquet phenomena and superconducting qubits
… quantum computing: from physical properties of superconducting qubits to computational properties of algorithms for quantum simulation. In the introduction, we begin by reviewing the circuit model of quantum computing. We then introduce circuit quantum electrodynamics (QED), the framework by …
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Non-Gaussian noise spectroscopy with superconducting qubits
… of a non-Gaussian dephasing process using a superconducting qubit as a noise spectrometer. This experimental demonstration of non-Gaussian noise spectroscopy protocol represents a major step towards the goal of demonstrating a complete noise spectral characterization of quantum devices.
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Design and Engineering of Protected Superconducting Qubits
… processors becomes increasingly promising as the qubits exhibit longer coherence times. To this end, realizing protected qubits, whose Hamiltonians are inherently resilient to both relaxation and dephasing, has attracted strong interest. In this thesis, we primarily explore the soft 0 − π qubit, a …
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Quantum Simulation of Many-body Systems with Superconducting Qubits
… the system. In this thesis, we discuss utilizing superconducting quantum circuits as a wellcontrolled quantum platform for probing the out-of-equilibrium dynamics and the properties of many-body quantum systems. We use a 3×3 array of superconducting transmon qubits to study the dynamics of a …
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Magnetic flux measurement of superconducting qubits with Josephson inductors
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Exploring Anisotropic Noise and Fast Gates with Superconducting Qubits
… addressing both coherence and control, utilizing superconducting qubits. Our first result is the characterization of superconducting qubit flux noise, a primary source of decoherence, under the influence of weak, in-plane magnetic fields. We reveal two trends which serve as a novel experimental …
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High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits
… progress toward achieving low error rates with superconducting qubits, error-prone gates remain the bottleneck in realizing quantum computing applications. To build robust quantum computers, it is crucial to identify the dominant sources of errors and suppress them by engineering the control and …
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Calibration and Control of Superconducting Qubits for Low‑Overhead Quantum Error Correction
… of the quantum computing stack, from physical qubits to theoretical algorithms. In this work, we address multiple layers of this stack. We develop a software architecture for scalable device calibration using modular calibration graphs. We introduce real‑time frequency stabilization techniques, …
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Optimizing coherence and anharmonicity of superconducting qubit
Quantum computers utilize qubits to store and process quantum information. In superconducting quantum computers, qubits are implemented as quantum superconducting resonant circuits. The circuits are operated only at the two energy states, which form the computational basis for the qubit. To …
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Towards a Quantum Network with Waveguide Quantum Electrodynamics
… and extensible quantum computation. Systems of superconducting qubits strongly coupled to a continuum of photonic modes in 1D coplanar waveguides, described by the formalism known as waveguide Quantum Electrodynamics (wQED), are emerging as a promising platform for quantum communication. In this …
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Low -Frequency 1/F Noise: Low Temperature Measurements and Effect on Superconducting Qubit Dephasing
… to substantial, measurement-induced dephasing in superconducting qubits. The purpose of this work is to measure this noise as a function of temperature and to simulate its effect on the measurement dynamics associated with superconducting qubits. In Nb trilayer junctions we measure the noise power …
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Low-frequency 1/f noise : low temperature measurements and effect on superconducting qubit dephasing
… to substantial, measurement-induced dephasing in superconducting qubits. The purpose of this work is to measure this noise as a function of temperature and to simulate its effect on the measurement dynamics associated with superconducting qubits. In Nb trilayer junctions we measure the noise power …
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Characterization of Magic-angle Twisted Bilayer Graphene using Microwave Techniques
… and potentially high kinetic inductance in the superconducting state are desirable properties for high-coherence, small-form-factor superconducting qubits. This thesis presents a promising experimental method to characterize MATBG in the gigahertz-frequency regime, the operating regime of …
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Novel Gates with Superconducting Fluxonium Qubits
Over the past two decades, superconducting qubits have emerged as a leading platform for gate-based quantum computation. Despite tremendous technological advancements, errors accumulating during gate operations are still a major bottleneck toward building a robust quantum computer. In general, …
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Towards a Modular Superconducting Quantum Processor using Chiral Waveguide Quantum Electrodynamics
As the field of superconducting quantum computing advances, networking qubits within a single system becomes essential for building modular processors. Modularity allows the system to circumvent scalability constraints and enable architectures and computational schemes that exploit non-local …
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All Pass Readout With Ring Resonators for Qubit Measurement
… as factoring and simulating quantum systems. Superconducting qubits, configurable artificial atoms comprised of circuit elements, are a leading platform to create quantum computers. Many schemes for superconducting qubit readout include a weakly coupled port as a capacitor in the feedline, …
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