  We perform quantum state reconstruction of coherent and thermal states with a
detector which has an enhanced multiphoton response. The detector is based on
superconducting nanowires, where the bias current sets the dependence of the
click probability on the photon number; this bias current is used as tuning
parameter in the state reconstruction. The nonlinear response makes our
nanowire-based detector superior to the linear detectors that are
conventionally used for quantum state reconstruction.
