- document
-
Bilmes, Alexander (author), Volosheniuk, S. (author), Ustinov, Alexey V. (author), Lisenfeld, Jürgen (author)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...journal article 2022
- document
-
Bilmes, Alexander (author), Händel, Alexander K. (author), Volosheniuk, S. (author), Ustinov, Alexey V. (author), Lisenfeld, Jürgen (author)Shadow evaporation is commonly used to micro-fabricate the key element of superconducting qubits—the Josephson junction. However, in conventional two-angle deposition circuit topology, unwanted stray Josephson junctions are created which contribute to dielectric loss. So far, this could be avoided by shorting the stray junctions with a so...journal article 2021