High-fidelity Parametric Entangling Gates for Superconducting Quantum Processors*

Parametrically-activated gates driven by a flux-tunable coupler are a promising approach to engineering fast, high-fidelity entanglement between fixed-frequency transmons. By selecting the proper resonance condition, we can generate both XY-like and ZZ-like interactions, improving the expressiveness of hardware native gatesets in superconducting quantum processors. In this work, we realize and benchmark high-fidelity iSWAP and CZ gates between qubits. We then demonstrate how these techniques can be extended to 3-level qutrit systems to engineer a two-qutrit parametric CZ gate.