superconducting nanowires*

We report frictional drag measurements between two superconducting LaAlO₃/SrTiO₃ nanowires. In these experiments, current passing through one nanowire induces a voltage across a nearby electrically isolated nanowire. The frictional drag signal contains both symmetric and antisymmetric components. The antisymmetric component arises from the rectification of quantum shot noise in the drive wire due to asymmetries in the drag wire. The symmetric component is ascribed to rectification of thermal noise in the drive wire during superconducting-normal transition. The absence of symmetric drag resistance between a normal drag wire and a superconducting drive wire suggests a higher electron-hole asymmetry in the superconducting LaAlO₃/SrTiO₃ nanowire arising from the 1D nature of superconductivity at LaAlO₃/SrTiO₃ interface.