Vacuum-gap transmon qubits realized using flip-chip technology

  1. Xuegang Li,
  2. Yingshan Zhang,
  3. Chuhong Yang,
  4. Zhiyuan Li,
  5. Junhua Wang,
  6. Tang Su,
  7. Mo Chen,
  8. Yongchao Li,
  9. Chengyao Li,
  10. Zhenyu Mi,
  11. Xuehui Liang,
  12. Chenlu Wang,
  13. Zhen Yang,
  14. Yulong Feng,
  15. Kehuan Linghu,
  16. Huikai Xu,
  17. Jiaxiu Han,
  18. Weiyang Liu,
  19. Peng Zhao,
  20. Teng Ma,
  21. Ruixia Wang,
  22. Jingning Zhang,
  23. Yu Song,
  24. Pei Liu,
  25. Ziting Wang,
  26. Zhaohua Yang,
  27. Guangming Xue,
  28. Yirong Jin,
  29. and Haifeng Yu
Significant progress has been made in building large-scale superconducting quantum processors based on flip-chip technology. In this work, we use the flip-chip technology to realize

Transmon qubit with relaxation time exceeding 0.5 milliseconds

  1. Chenlu Wang,
  2. Xuegang Li,
  3. Huikai Xu,
  4. Zhiyuan Li,
  5. Junhua Wang,
  6. Zhen Yang,
  7. Zhenyu Mi,
  8. Xuehui Liang,
  9. Tang Su,
  10. Chuhong Yang,
  11. Guangyue Wang,
  12. Wenyan Wang,
  13. Yongchao Li,
  14. Mo Chen,
  15. Chengyao Li,
  16. Kehuan Linghu,
  17. Jiaxiu Han,
  18. Yingshan Zhang,
  19. Yulong Feng,
  20. Yu Song,
  21. Teng Ma,
  22. Jingning Zhang,
  23. Ruixia Wang,
  24. Peng Zhao,
  25. Weiyang Liu,
  26. Guangming Xue,
  27. Yirong Jin,
  28. and Haifeng Yu
By using the dry etching process of tantalum (Ta) film, we had obtained transmon qubit with the best lifetime (T1) 503 us, suggesting that the dry etching process can be adopted in

Realisation of adiabatic and di-adiabatic CZ gates in superconducting qubits coupled with a tunable coupler

  1. Huikai Xu,
  2. Weiyang Liu,
  3. Zhiyuan Li,
  4. Jiaxiu Han,
  5. Jingning Zhang,
  6. Kehuan Linghu,
  7. Yongchao Li,
  8. Mo Chen,
  9. Zhen Yang,
  10. Junhua Wang,
  11. Teng Ma,
  12. Guangming Xue,
  13. Yirong Jin,
  14. and Haifeng Yu
High fidelity two-qubit gates are fundamental for scaling up the superconducting number. We use two qubits coupled via a frequency-tunable coupler which can adjust the coupling strength,