Probing defect densities at the edges and inside Josephson junctions of superconducting qubits
Probing defect densities at the edges and inside Josephson junctions of superconducting qubits
Tunneling defects in disordered materials form spurious two-level systems which are a major source of decoherence for micro-fabricated quantum devices. For superconducting qubits, defects in tunnel barriers of submicrometer-sized Josephson junctions couple strongest to the qubit, which necessitates optimization of the junction fabrication to mitigate defect formation. Here, we investigate …