Toward a scalable and high-fidelity quantum computing system with fluxonium qubits

Fluxonium has been attracting increasing interest from the superconducting qubit community as an alternative qubit platform for high-fidelity quantum computing. However, advancements in several aspects, including device fabrications for a high qubit yield, maintaining high coherence while allowing for fast operations, and enabling a scalable processor architecture, are still needed before fluxonium can be adopted as a mainstream of choice. At Alibaba Quantum Laboratory, we study these problems using a full-stack approach: from searching robust new materials for the superinductor, to investigating the decoherence mechanisms of the qubit, and lastly to exploring quantum instruction sets for a fluxonium quantum processor to improve system performance. We summarize our progress in the above aspects and discuss our perspectives toward realizing a scalable and high-fidelity quantum computing system with fluxonium qubits.