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VACUUM ›› 2022, Vol. 59 ›› Issue (2): 1-5.doi: 10.13385/j.cnki.vacuum.2022.02.01

• Measurement and Control •     Next Articles

Josephson Junction Fabrication System

XIONG Kang-lin1,2, FENG Jia-gui1,2, XIA Hui-zhi2, YANG Hui-yong2, ZHAO Yu-kun1, LU Shu-long1, ZHANG Yong-hong1   

  1. 1. Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China;
    2. GUSU Laboratory of Materials, Suzhou 215123, China
  • Received:2021-04-25 Online:2022-03-25 Published:2022-04-14

Abstract: Josephson junction is the key electrical element in superconductive electronics and quantum information. It is a type of non-linear device composed of two superconductors separated by a thin dielectric. Most superconducting qubits use the Al/AlOx/Al junction. The fabrication of such junctions on quantum chips involves ion beam etching, electron beam evaporation with adjustable sample orientation, and controllable oxidation. The samples should not leave the vacuum during the fabrication process. The homemade Josephson junction processing system is a ultra high vacuum system with three processing chambers. Samples can be automatically transferred between the chambers to complete the fabrication. The processing steps of the system have been experimentally verified.

Key words: superconducting circuit, Josephson junction, ion etching, e-beam evaporation

CLC Number: 

  • TN305.8
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