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 “"transmon"”.
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Higher levels of the transmon qubit
… in measuring the properties of higher levels in transmon qubit systems. The first part includes a thorough overview of transmon devices, explaining the principles of the device design, the transmon Hamiltonian, and general Circuit Quantum Electrodynamics concepts and methodology. The second part …
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Study of the effects of surface cladding on 3D transmon
… the surface of qubit. To this end I fabricate 3D transmon qubits using materials grown my molecular beam epitaxy, to which a variety of different surface treatments had been applied. I began by fabricating qubits from niobium/aluminum oxide/niobium trilayers. To this end I developed a self-aligned …
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High Fidelity Universal Gates Performed on a Continuously-Decoupled Coherence Enhanced Transmon Qubit
… my particular test-platform, the superconducting transmon.
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QUBIT COUPLED MECHANICAL RESONATOR IN AN ELECTROMECHANICAL SYSTEM
… 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 reflective …
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Extensible Platforms for Bosonic Quantum Error Correction
… microwave cavity controlled via fixedfrequency transmon qubits [1, 2, 3, 4, 5, 6]. To date, all previous demonstrations have been limited by bit-flips in the transmon control qubit (with typical T1 lifetimes on the order of 100 microseconds), resulting in logical lifetimes that are upper-bounded …
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Flux-tunable superconducting transmons for quantum information processing
… a series of experiments using flux-tunable transmon qubits for quantum information processing. These qubits are designed with different levels of Josephson junction asymmetry. The first two chapters of this thesis will introduce the reader to superconducting qubits and circuit quantum …
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Novel Gates with Superconducting Fluxonium Qubits
… containing fluxonium qubits coupled via a transmon coupler (FTF for fluxonium-transmon-fluxonium) and demonstrate high-fidelity novel gates, achieving up to 99.99% fidelity single-qubit gates and 99.9% two-qubit gates on the same device. We show that this coupling scheme has advantages for …
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Multimode Circuit Quantum Electrodynamics With Superconducting Metamaterial Resonators
… we study the coupling of a flux-tunable transmon qubit to a dense spectrum of microwave modes generated by a superconducting metamaterial resonator. We measure the interaction between the transmon and metamaterial by both direct microwave transmission through the metamaterial resonator …
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Development of potential-based time domain integral equations for quantum electrodynamics modeling
… produced by a single photon source built from a transmon qubit.
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Calibration and Utilization of High-Fidelity Two-Qubit Operations
… CZ and CPhase gates for flux-tunable transmon qubits. We develop a new technique for mitigating coherent errors in twoqubit gates called quantum measurement emulation (QME). We use this technique to implement a novel operation called density matrix exponentiation (DME), which has …
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High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits
… we exploit the multiple level transitions of a transmon sensor to distinguish the noise contributions from flux and photon shot noise. The control protocols developed in this thesis may help resolve hardware challenges in building quantum computers with low error rates.
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Non-Gaussian Noise in Superconducting Circuits
… non-Gaussian fluctuations using a system of Transmon qubits as ultra-sensitive quantum sensors and make the first clear experimental observation of non-Gaussian noise in a qubit system. I achieve this using multi-qubit dynamical decoupling sequences that characterize noise during two-qubit …
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Quantum Simulation of Many-body Systems with Superconducting Qubits
… systems. We use a 3×3 array of superconducting transmon qubits to study the dynamics of a particle under the tight-binding model, and probe quantum information propagation by measuring out-of-time-ordered correlators (OTOCs). Using a 4×4 qubit array, we probe entanglement across the energy …
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Fabrication and Characterization of Superconducting Metamaterial Resonators
… the first experiments with a superconducting transmon qubit coupled to a metamaterial resonator and we describe our progress in this direction.</p>
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Préparation d'un état de chat dans une architecture de l'électrodynamique quantique en circuit
… avec un qubit supraconducteur de type transmon en régime dispersif permettent l'encodage de tels états. Pour opérer ce dispositif, un montage expérimental permettant le contrôle du qubit ancillaire et de la cavité ainsi que la lecture dispersive du qubit a été mis en œuvre. Les états de …
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Quantum State Estimation and Tracking for Superconducting Processors Using Machine Learning
… example, tracking the state of a superconducting transmon qubit continuously with dynamics fast compared with the detector bandwidth. These results open up a new area of quantum state tracking, enabling us to potentially diagnose errors that occur during quantum gates. In addition, I investigate …
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Graphene-Based Nanodevices in the Superconducting and Strongly Correlated Regimes
… create and manipulate the first graphene-based transmon qubit. In the second part of this dissertation, the electronic properties of graphene-based systems are engineered by controlling the relative twist angle between the atomic planes. In particular, when two graphene sheets are stacked on top …
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Using Device Physics and Error Mitigation to Improve the Performance of Quantum Computers
… Then, we implement entangling gates on real transmon qubits. Finally, we develop new techniques for entangling gates on spin qubits. In total, we improve low-level device performance with high-fidelity entangling operations. Secondly, we focus on quantum simulation algorithms. First, we apply …
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Meissner qubit: architecture, characterization and vortex-probing applications
This Dissertation was approved for publication on 2016-04-20 at 12:00.
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