Baseband control of biased-noise fluxonium with tunable Josephson energy

Biased-noise qubits are insensitive to either depolarization or dephasing errors and can reduce the threshold for quantum error correction. However, they are often harder to control than conventional qubits and can have more complex circuit designs. One such biased-noise qubit is the heavy fluxonium qubit in the asymmetric double-well regime. Due to vanishing qubit matrix elements, this device requires novel control schemes and possibly harnessing tunable elements. In this work, we explore control of the heavy fluxonium by engineering a tunable Josephson energy. We utilize baseband pulses to control the multiloop device and measure device coherence on and off the sweet spots.