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Method for investigating the properties of a superconducting quantum magnetic-flux meter

V. A. Kozlov, N.D. Kozlova, E.M. Savitskii, I. I. Bykov

Published Jan 1, 1975• 0 citations
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We developed a minimal method of forming and detecting a fractional magnetic flux quantum in a two-component superconductor fabricated using an ultra-thin niobium bilayer that sandwiches a Josephson barrier. The fractional quantum created by cooling a bilayer disk in the magnetic field survived after turning off the magnetic field. The survived quantum was confirmed by the change in the critical current of a superconducting quantum interference device (SQUID) placed on the bilayer disk. By replacing a flux qubit with the SQUID, we can use the fractional flux quantum as the flux bias for the flux qubit. This method enables the investigation of fractional quantization and the related topology.
The properties of an YBa2Cu3O7−d superconducting quantum interference device (SQUID) have been evaluated magneto-optically and electrically. It was found that the operating characteristics of the SQUID observed by means of the magneto-optical (MO) method show a good consistency with those measured by the electrical method. Furthermore, we have succeeded in the MO detection of local magnetic signals corresponding to the single flux quantum pulses generated in the SQUID loop applied with an external pulsed magnetic field. These results indicate that the MO probe has the potential to be applied to an optical output interface for superconducting magnetic flux devices.