| 摘要 |
PURPOSE: To form an effective superconducting quantum thin wire in normal conductor forming a superconducting junction, by designing the width of a superconducting electrode to be narrower than an ordinary superconducting junction. CONSTITUTION: The width of superconducting electrodes 301, 302 is 1.0μm, and the electrode width of their tip parts is 0.5μm. The interval 200 between the superconducting electrodes 301 and 302 of superconducting junction parts where the superconducting electrodes face with each other via normal conductor is 0.5μm. In the state that a gate voltage is not applied, superconductivity couples in the normal conductor constituting the superconducting junction in a region which becomes shorter than the coherence length. The region becomes equivalent to a superconducting quantum wire. The width of the region where superconductivity couples in the normal conductor becomes much thinner than the width of an actual superconducting electrode, as the result of the influence of the boundary in the electrode width direction. When the width of the superconducting coupling region becomes narrower than the normal coherence length, an effective superconducting quantum wire can be formed in the normal conductor forming the superconducting junction.
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