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 “"Superconducting qubit"”.
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Machine Learning Assisted Superconducting Qubit Readout
… challenges are efficient and high-fidelity multi-qubit control and readout. In particular, qubit-state readout is a significant error source in contemporary superconducting quantum processors. The fidelity of dispersive qubit-state readout depends on the readout pulse shape and frequency as well …
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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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Digital Readout and Control of a Superconducting Qubit
… to build a fault-tolerant quantum computer, superconducting circuits based on Josephson junctions have emerged as a leading architecture. Coherence times have increased significantly over the last two decades, and processors with ∼ 50 qubits have been experimentally demonstrated. These …
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Superconducting qubit readout pulse optimization using deep reinforcement learning
… significantly faster than classical computers. Superconducting quantum processors comprising more than 50 qubits can achieve quantum supremacy, the ability to outperform existing classical computers for particular problems. However, to build a useful quantum computer, the quantum processor's …
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Nonadiabatic control of a superconducting qubit via strong driving
… the bits of a classical computer with quoits. Qubits generalize bits by allowing not only the classical states of zero and one, but also any arbitrary superposition of zero and one. These qubits are implemented as two-state systems by mapping the classical one and zero states to two orthogonal …
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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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The Arm Qubit for Faster, Higher Fidelity Readout and Gates
Currently, superconducting qubit processors are bottlenecked by errors during two-qubit gates, readout, and idle time. All three error contributions could be reduced if we improved the speed of operations (without introducing additional leakage errors) compared to the qubit lifetime. Readout and …
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High-efficiency, low-loss Floquet Josephson Traveling Wave Parametric Amplifier
… amplifier (Floquet TWPA). Fabricated in a superconducting qubit process, this Floquet TWPA achieves minimal dissipation, quantum-limited noise performance, and broadband operation. Our device exhibits > 20-dB amplification over a 3-GHz instantaneous bandwidth, <0.5 -dB average in-band …
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Nonlinearity engineering with the Quarton
… call "nonlinearity engineering" using a recent superconducting qubit, the Quarton. In traditional nonlinear optics, nonlinear effects are usually weak perturbations to linear interactions. Similarly, microwave quantum optics with superconducting circuits relies on the Josephson junction for a …
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Quantum acoustics with a released thickness-mode mechanical resonator
… platform integrates the strong nonlinearity of superconducting Josephson elements with high-quality mechanical resonators, enabling potential applications in quantum memories, transducers, and sensors. A central challenge in this field is achieving strong electromechanical coupling between the …
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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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QUBIT COUPLED MECHANICAL RESONATOR IN AN ELECTROMECHANICAL SYSTEM
… resonator is capacitively coupled to a superconducting transmon which is embedded in a superconducting coplanar waveguide (CPW) cavity. The difficulty of achieving high quality of superconducting qubit in a high-quality voltage-biased cavity is overcome by integrating a superconducting …
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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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Numerical analysis for quantum electrodynamics in the ultrastrong coupling regime
… computer demands lower gate error rates, longer qubit coherence times, increased qubit connectivity, and enhanced controllability of qubit couplings. Addressing these challenges necessitates accurate simulations of quantum devices, beginning with the foundational task of properly selecting or …
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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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Fabrication of Superconducting Reflectionless Filters for Quantum Microwave Circuits
The performance and scalability of superconducting quantum circuits depends critically on the microwave environment. Minimizing signal reflections and suppressing thermal noise are essential for achieving high-fidelity readout and preserving qubit coherence. A significant challenge arises from the …
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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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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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The Quarton Coupler for Near-Ultrastrong Nonlinear Light-Matter Coupling in Superconducting Circuits
… = (4.852 ± 0.006) × 10⁻² nonlinear coupling of a superconducting artificial atom and a nearly-linear resonator. We also show signatures of light-light nonlinear coupling [formula], and 𝜒/2𝜋 = 580.3 ± 0.4 MHz matter-matter nonlinear coupling [formula] which represents the largest reported 𝑍𝑍 …
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