Hybrid superconducting quantum magnetometer

A superconducting quantum magnetometer based on magnetic flux-driven modulation of the density of states of a proximized metallic nanowire is theoretically analyzed. With optimized geometrical and material parameters transfer functions up to a few mV/?0 and intrinsic flux noise ~10-9?0/?Hz below 1 K are achievable. The opportunity to access single-spin detection joined with limited dissipation (of the order of ~10-14 W) make this magnetometer interesting for the investigation of the switching dynamics of molecules or individual magnetic nanoparticles.