286th RQC Seminar

• 講演者

  Dr. Gianluigi Catelani
  ( Forschungszentrum Jülich, Germany )

• 日程

  2026年6月9日(火), 16:00 - 17:00 (4:00pm - 5:00pm)

• 開催場所

  ハイブリッド（Zoom,
  和光地区 統合支援施設2階 大会議室 / Large Meeting Room, 2F, Welfare and Conference Building, Wako Campus (C61))

• 講演タイトル

  Improved modeling of superconducting circuitsomputing

• お問合せ

  yasunobu.nakamura[at]riken.jp

講演概要
More accurate control and reduced losses are needed for superconducting circuits to move beyond the current NISQ era in quantum computing applications and to devise better detectors. In this talk I will discuss some recent advances and their impacts on designing superconducting devices. After briefly reviewing quasipartcles in qubits, I will show how a form of so-called "gap engineering", in which the values of the superconducting gap on the two sides of a junction are properly chosen, can mitigate errors related to quasiparticles [1,2,3]. Next, I will introduce a more realistic model for tunneling across a Josephson junction, which is needed to accurately describe qubit spectroscopic data [4]. Finally, I will consider the role of pair-breaking photons in limiting a resonator quality factor [5].

[1] G. Marchegiani et al., PRX Quantum 3, 040338 (2022)
[2] J. Krause et al., Phys. Rev. Applied 22, 044063 (2024)
[3] G. Marchegiani and G. Catelani, Commun Phys 8, 120 (2025)
[4] D. Willsch et al., Nat Phys 20, 815 (2024)
[5] P. B. Fischer and G. Catelani, SciPost Phys. 17, 070 (2024)