Superconducting transmon qubit; control and characterisation

Abstract

Abstract Superconducting qubits are on the cutting edge of quantum processor research and development, requiring amplitude and phase-modulated microwave frequency pulses to control and monitor. This dissertation focuses on the control and characterization of a superconducting qubit. It starts with theoretical understanding and advances to experimental setups and experiments, followed by result analysis and characterization. The utmost aspiration for this project is to institute a quantum processor and peripheral system that is prepared and optimized for computing activities. In the studies mentioned, the experiments have been conducted using a single superconducting transmon qubit connected to a 3D cavity system. In this dissertation, we will begin with discussing about the basic realisations of a superconducting qubit and it’s interaction with the environment which is essential for probing the qubit using circuit quantum electrodynamics, followed by an idea of the control environment, readout and the qubit dynamics in chapter 2. The experimental arrangements needed and used are talked about in chapter 3. We then proceed on to the experimental methodology for qubit manipulation and characterisation in chapter 4. In Chapter 5,results are reported and analysed. Concluding the research, parting remarks are left in Chapter 6. Key words: Quantum computer, Qubit, Transmon, Microwave, Resonator