Multiplexed control scheme for scalable quantum information processing with superconducting qubits

  1. Pan Shi,
  2. Jiahao Yuan,
  3. Fei Yan,
  4. and Haifeng Yu
The advancement of scalable quantum information processing relies on the accurate and parallel manipulation of a vast number of qubits, potentially reaching into the millions. Superconducting

Performing SU(d) operations and rudimentary algorithms in a superconducting transmon qudit for d=3 and d=4

  1. Pei Liu,
  2. Ruixia Wang,
  3. Jing-Ning Zhang,
  4. Yingshan Zhang,
  5. Xiaoxia Cai,
  6. Huikai Xu,
  7. Zhiyuan Li,
  8. Jiaxiu Han,
  9. Xuegang Li,
  10. Guangming Xue,
  11. Weiyang Liu,
  12. Li You,
  13. Yirong Jin,
  14. and Haifeng Yu
Quantum computation architecture based on d-level systems, or qudits, has attracted considerable attention recently due to their enlarged Hilbert space. Extensive theoretical and experimental

Error per single-qubit gate below 10−4 in a superconducting qubit

  1. Zhiyuan Li,
  2. Pei Liu,
  3. Peng Zhao,
  4. Zhenyu Mi,
  5. Huikai Xu,
  6. Xuehui Liang,
  7. Tang Su,
  8. Weijie Sun,
  9. Guangming Xue,
  10. Jing-Ning Zhang,
  11. Weiyang Liu,
  12. Yirong Jin,
  13. and Haifeng Yu
Implementing arbitrary single-qubit gates with near perfect fidelity is among the most fundamental requirements in gate-based quantum information processing. In this work, we fabric

Baseband control of superconducting qubits with shared microwave drives

  1. Peng Zhao,
  2. Ruixia Wang,
  3. Mengjun Hu,
  4. Teng Ma,
  5. Peng Xu,
  6. Yirong Jin,
  7. and Haifeng Yu
Accurate control of qubits is the central requirement for building functional quantum processors. For the current superconducting quantum processor, high-fidelity control of qubits

Spurious microwave crosstalk in floating superconducting circuits

  1. Peng Zhao,
  2. Yingshan Zhang,
  3. Xuegang Li,
  4. Jiaxiu Han,
  5. Huikai Xu,
  6. Guangming Xue,
  7. Yirong Jin,
  8. and Haifeng Yu
Crosstalk is a major concern in the implementation of large-scale quantum computation since it can degrade the performance of qubit addressing and cause gate errors. Finding the origin

Combating fluctuations in relaxation times of fixed-frequency transmon qubits with microwave-dressed states

  1. Peng Zhao,
  2. Teng Ma,
  3. Yirong Jin,
  4. and Haifeng Yu
With the long coherence time, fixed-frequency transmon qubit is a promising qubit modality for quantum computing. Currently, diverse qubit architectures that utilize fixed-frequency

Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits

  1. Peng Zhao,
  2. Kehuan Linghu,
  3. Zhiyuan Li,
  4. Peng Xu,
  5. Ruixia Wang,
  6. Guangming Xue,
  7. Yirong Jin,
  8. and Haifeng Yu
Maintaining or even improving gate performance with growing numbers of parallel controlled qubits is a vital requirement towards fault-tolerant quantum computing. For superconducting

Realizing discrete time crystal in an one-dimensional superconducting qubit chain

  1. Huikai Xu,
  2. Jingning Zhang,
  3. Jiaxiu Han,
  4. Zhiyuan Li,
  5. Guangming Xue,
  6. Weiyang Liu,
  7. Yirong Jin,
  8. and Haifeng Yu
Floquet engineering, i.e. driving the system with periodic Hamiltonians, not only provides great flexibility in analog quantum simulation, but also supports phase structures of great

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