Magnetic imaging of superconducting qubit devices with scanning SQUID-on-tip

A. Wallraff; E. Marchiori; G. Romagnoli; J.-C. Besse; J. Herrmann; L. Ceccarelli; M. Poggio; N. Rossi; S. Krinner

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Magnetic imaging of superconducting qubit devices with scanning SQUID-on-tip

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arxiv 2206.08163 v1 pith:PLW34P23 submitted 2022-06-16 cond-mat.supr-con

E. Marchiori , L. Ceccarelli , N. Rossi , G. Romagnoli , J. Herrmann , J.-C. Besse , S. Krinner , A. Wallraff

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M. Poggio

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keywords superconductingmagneticqubitcurrentdevicefluxquantumscanning

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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.

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