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(a) Diagram of a cryotron device. The signal line is a superconducting wire that can be driven normal by a magnetic field created by current in the control line. (b) Schematic of our cryotron model. Since the device is operated far below the Tc of Nb, the current in the Nb travels at the edge of the wire. This current creates a magnetic field that can drive the signal line, located a distance d away, normal.
