Towards High-fidelity Two-qubit Gates: Static ZZ Suppression via Multipath Coupling in Inductively Coupled Fluxonium Qubits - Part I

Compared to capacitive coupling, inductively coupled fluxoniums provide enhanced hybridization of computational states, facilitating entanglement with suppressed ZZ crosstalk. Utilizing a tunable coupler, high-fidelity gates between inductively coupled fluxonium qubits were demonstrated.[1] Here we demonstrate the implementation of static ZZ suppression through multipath coupling in directly inductively coupled fluxonium qubits. This scheme, designed for high-fidelity gate operations, can benefit advancing fluxonium-based quantum processors and broadening the horizons of universal quantum computing. In this part, we present an exhaustive circuit analysis for these multipath-coupled fluxonium qubits.

[1] arXiv preprint arXiv:2309.0572 (2023)