High-fidelity entangling gates for fluxonium qubits

Fluxonium is the one of the promising candidates for the next generation of superconducting quantum processors due to its long coherence time and large anharmonicity. These qualities make it feasible to achieve ultra-high fidelity entangling gates. In this work, we theoretically analyze and compare various two-qubit gate schemes with all-microwave drives, as well as those with qubit frequency tuning, and numerically demonstrate how to obtain high fidelities. We will show further improvement of the gate fidelity by suppressing ZZ crosstalk and dephasing noise via dynamical decoupling with continuous drives. In addition, we will also discuss the many-body effect on two-qubit gates in multi-qubit devices.