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Theses | Superconducting Quantum Devices Laboratory

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Theses

2019

Coupling superconducting artificial atoms to the continuum of modes in a waveguide opens a door for probing a vast range of atom-light interactions in an open space configuration. In this thesis, we experimentally implement a platform where two transmon-type superconducting qubits are coupled to the one-dimensional fields confined in a rectangular waveguide.

2018

This research investigates a regime where suciently rapid dynamics are induced in the qubit such that the resonator can no longer distinguish between the two qubit states. These
dynamics can be induced by a strong, coherent driving eld. This is proposed to eradicate the ability to measure the qubit, and suppress the associated ac-Stark shift induced dephasing. These mechanisms are tested through the creation and use of a numerical simulation of the Lindblad master equation and experimental measurements of a transmon qubit in the strong driving regime.

2017

The thesis studies the dependence of a dispersive shift of a transmon qubit as function of its detuning from the frequency of the resonator. The dispersive shift was measured both for both on-chip CPW resonator and for 3D cavity. Experimental data were compared to the second and forth order analitical formula.

2014

The thesis studied implementation of the Quantum State Tomography in a circuit QED architecture, providing a practical tool that is essential to the ongoing study of quantum dynamics of computation within the Superconducting Quantum Devices Lab.

Thesis presents a detailed characterization of a parametric amplifier, in terms of its frequency tuneability, Josephson junction characteristics, quality factors, driving power regimes, and its gain performance.