Characterization of Single- and Two-qubit Gates between Transmons and Capacitively Shunted Flux Qubits

Capacitively shunted flux qubits (CSFQs) with high coherence hold promise for improved single- and two-qubit gate operations due to their relatively large and positive anharmonicity. When paired with transmon qubits, CSFQs may lead to a novel regime for two-qubit gates based on the cross resonance interaction. We fabricated a two-qubit system consisting of a CSFQ and a fixed-frequency transmon coupled via a bus cavity and we characterized the fidelity of single- and two-qubit gate operations. In this talk, we will present experimental results from these measurements.