| 摘要 |
PURPOSE:To eliminate an effect by magnetic flux trapped by a grounding thin-film by fitting a plurality of terminals feeding vortex driving currents to a first thin-film while arranging a second thin-film in a shape that paths for vortex driving currents are narrowed or current paths among the terminals and a grounding terminal are interrupted. CONSTITUTION:When grounding thin-films are formed by a thin-film 1 and partition walls 2, the superconducting critical temperature of the thin-film 1 is represented by TCG and the superconducting critical temperature of the partition wall 2 by TCG' and TCG>T>TCG' holds in the ambient temperature T of a circuit, the partition wall 2 is brought to a normal conductive state, and the thin-film 1 is brought to a superconducting state. When a Josephson circuit thin-film is brought to the normal conductive state under the state and DC currents are injected into the grounding thin-films from a vortex driving current supply terminal 3, vortexes are moved in the grounding thin-films by Lorentz's force. The grounding thin-films are divided by the double pectinate partition walls 2 under the normal conductive state at that time, and currents injected from the terminal 3 move in a zigzag manner and flow in the grounding thin-films. Accordingly, vortexes are shifted by a small quantity of driving currents, and can be concentrated to the peripheral sections of the grounding thin-films and the peripheries of the partition walls, thus avoiding an effect by magnetic flux trapped by the grounding thin-films. |
