Control and Readout of Single Superconducting Qubit

KAI-I CHU^1*, Yung-Fu Chen¹

¹Department of Physics, National Central University, Jungli, Taiwan

* Presenter:KAI-I CHU, email:a13579113119@gmail.com

We study a transmon superconducting qubit coupled to a readout cavity in the strong dispersive regime using dispersive readout and Jaynes-Cummings readout. From spectroscopy results, the qubit transition frequency and coupling strength g_ge are determined. We demonstrate several hallmark time-domain control experiments - Rabi oscillation, Ramsey Fringe and Spin echo experiment. We then observe the relaxation time T_1 and decoherence time T_2 which are the significant characteristic of the qubit. We also demonstrate the state tomography experiment. Recently, we study single qubit gate fidelity with quantum process tomography and randomized benchmarking. We complete the quantum process tomography experiment, but we have not yet analyzed it. We also build up the randomized benchmarking experiment simultaneously.

Keywords: Superconducting qubit, Rabi oscillation, Ramsey Fringe, State tomography, Gate fidelity