| 摘要 |
A superconducting memory circuit includes a superconducting loop composed of first and second superconducting lines, and bias lines are connected to connection points of the first and second lines. Inductance or critical current values of the first and second lines are different from each other. When a current is supplied to the bias lines, the current is divided and flows in the loop to maintain a magnetic flux thereof at zero. If the current is further increased, a current flowing in one superconducting line reaches the critical current value of itself prior to the other superconducting line, and a larger current flows in the other superconducting line such that a superconducting state is not destroyed. Therefore, a magnetic flux is generated in the loop. If the current of the bias lines is shut-off in this state, a persistent current flows in the loop to maintain the magnetic flux. Thus, "1" can be written. If a current in reverse direction is supplied to the bias lines so as to make the magnetic flux in the loop zero and the current is shut-off in that state, the persistent current does not flow in the loop. Therefore, the magnetic flux disappears, and thus, "0" can be written. The magnetic flux of the loop can be detected by a read line including a Josephson weak-link therein.
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