Abstract
We demonstrate a simple and robust method for inducing and detecting changes ofmagnetic flux quantization in the absence of an externally applied magnetic field. In ourdevice, an isolated ring is interconnected with two access loops via permalloy cores, forminga superconducting transformer. By applying and tuning a direct current at the firstaccess loop, the number of flux quanta trapped in the isolated ring is modifiedwithout the aid of an external field. The flux state of the isolated ring is simplydetected by recording the evolution of the critical current of the second accessloop.
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