Magnetic imaging of superconducting qubit devices with scanning SQUID-on-tip
Estefani Marchiori, L. Ceccarelli, N. Rossi +6 more
We use a scanning superconducting quantum interference device (SQUID) to image the magnetic flux produced by a superconducting device designed for quantum computing. The nanometer-scale SQUID-on-tip probe reveals the flow of superconducting current through the circuit as well as the locations of trapped magnetic flux. In particular, maps of current flowing out of a flux-control line in the vicinity of a qubit show how these elements are coupled, providing insight on how to optimize qubit control.
arXiv:2206.08163•Applied Physics Letters•Aug 1, 2022•26 citations