Fast-flux operation of a noise-biased fluxonium qubit

We present results on a fluxonium superconducting qubit with a tunable Josephson energy operated in the noise-biased bit-flip protected regime. The circuit's tunability arises from the SQUID loop that replaces the lone junction. The noise bias is achieved by operating away from flux frustration, where the matrix elements are exponentially suppressed, but the circuit is first-order sensitive to flux noise. We discuss design considerations such as parameter choices and circuit geometry. We explore gate schemes that harness fast-flux control in the noise-biased regime and their trade-offs.