New preprint: “Scalable Fluxonium-Transmon Architecture for Error Corrected Quantum Processors”
Our new work, “Scalable Fluxonium-Transmon Architecture for Error-Corrected Quantum Processors”, has recently been released on the arXiv.
In collaboration with colleagues from the Walther-Meissner-Institute in Garching, we introduce a novel hybrid qubit system that combines fluxoniums and transmons within a single architecture. We show that this system exhibits excellent scaling properties, opening a new pathway to integrate fluxoniums into scalable designs and therefore addressing a major challenge in current superconducting qubit research. This architecture is particularly well-suited for surface code implementations, as it leverages the long coherence times of fluxoniums (serving as data qubits) alongside the well-established measurement procedures of transmons (used as ancillas).
We simulate a high-fidelity CZ gate, activated by coherently driving the transmon tunable coupler with an AC flux-pulse to generate a resonant transition between the |11⟩ state and the second excited state of the fluxonium. Importantly, we demonstrate that this gate maintains its performance even in the presence of spectator qubits, making this architecture a promising candidate for future quantum error correction schemes.