Tileable Fluxonium Architecture with Ultrafast Inductive Single-Qubit Control Part 1: Theory

Fluxonium-based designs have been used to demonstrate millisecond-scale coherence and high-fidelity gates, making them a leading candidate for the next generation of superconducting QPUs. In this work, we present a blueprint for a tileable fluxonium architecture with inductive coupling and all-flux control. We analyze qubit coherence and ultrafast single-qubit gate fidelity with subharmonic driving by exploring different circuit parameter regimes using numerical simulations. We also compare capacitively- and inductively-coupled readout schemes for our design. Finally, we outline a roadmap for two-qubit gate schemes in this architecture to enable scaling out to multiple qubits.