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The modern understanding of the Josephson effect in mesosopic devices derivesfrom the physics of Andreev bound states, fermionic modes that are localized ina superconducting weak link. Recently, Josephson junctions constructed usingsemiconducting nanowires have led to the realization of superconducting qubitswith gate-tunable Josephson energies. We have used a microwave circuit QEDarchitecture to detect Andreev bound states in such a gate-tunable junctionbased on an aluminum-proximitized InAs nanowire. We demonstrate coherentmanipulation of these bound states, and track the bound-state fermion parity inreal time. Individual parity-switching events due to non-equilibriumquasiparticles are observed with a characteristic timescale $T_\mathrm{parity}= 160\pm 10~\mathrm{\mu s}$. The $T_\mathrm{parity}$ of a topological nanowirejunction sets a lower bound on the bandwidth required for control of Majoranabound states.

Direct microwave measurement of Andreev-bound-state dynamics in a proximitized semiconducting nanowire