Magnetic imaging of superconducting qubit devices with scanning SQUID-on-tip
Estefani Marchiori, Lorenzo Ceccarelli, N. Rossi, Giulio Romagnoli, J. Herrmann, Jean-Claude Besse, Sebastian Krinner, Andreas Wallraff, Martino Poggio
Abstract
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.
Topics & Concepts
SquidFlux qubitScanning SQUID microscopySuperconductivityQubitPhase qubitMagnetic fluxCharge qubitPhysicsMagnetic flux quantumCondensed matter physicsFlux (metallurgy)Magnetic fieldQuantumMagnetometerMaterials scienceQuantum mechanicsJosephson effectGradiometerEcologyBiologyMetallurgyQuantum and electron transport phenomenaPhysics of Superconductivity and MagnetismAdvancements in Semiconductor Devices and Circuit Design