  We present a hybrid semiconductor-based superconducting qubit device which
remains coherent at magnetic fields up to 1 T. The qubit transition frequency
exhibits periodic oscillations with magnetic field, consistent with
interference effects due to the magnetic flux threading the cross section of
the proximitized semiconductor nanowire junction. As induced superconductivity
revives, additional coherent modes emerge at high magnetic fields, which we
attribute to the interaction of the qubit and low-energy Andreev states.
