Jiale Yu

Realization of fast all-microwave CZ gates with a tunable coupler

  1. Shaowei Li,
  2. Daojin Fan,
  3. Ming Gong,
  4. Yangsen Ye,
  5. Xiawei Chen,
  6. Yulin Wu,
  7. Huijie Guan,
  8. Hui Deng,
  9. Hao Rong,
  10. He-Liang Huang,
  11. Chen Zha,
  12. Kai Yan,
  13. Shaojun Guo,
  14. Haoran Qian,
  15. Haibin Zhang,
  16. Fusheng Chen,
  17. Qingling Zhu,
  18. Youwei Zhao,
  19. Shiyu Wang,
  20. Chong Ying,
  21. Sirui Cao,
  22. Jiale Yu,
  23. Futian Liang,
  24. Yu Xu,
  25. Jin Lin,
  26. Cheng Guo,
  27. Lihua Sun,
  28. Na Li,
  29. Lianchen Han,
  30. Cheng-Zhi Peng,
  31. Xiaobo Zhu,
  32. and Jian-Wei Pan
The development of high-fidelity two-qubit quantum gates is essential for digital quantum computing. Here, we propose and realize an all-microwave parametric Controlled-Z (CZ) gates
by coupling strength modulation in a superconducting Transmon qubit system with tunable couplers. After optimizing the design of the tunable coupler together with the control pulse numerically, we experimentally realized a 100 ns CZ gate with high fidelity of 99.38%±0.34% and the control error being 0.1%. We note that our CZ gates are not affected by pulse distortion and do not need pulse correction, {providing a solution for the real-time pulse generation in a dynamic quantum feedback circuit}. With the expectation of utilizing our all-microwave control scheme to reduce the number of control lines through frequency multiplexing in the future, our scheme draws a blueprint for the high-integrable quantum hardware design.
arxiv pdf

Observation of thermalization and information scrambling in a superconducting quantum processor

  1. Qingling Zhu,
  2. Zheng-Hang Sun,
  3. Ming Gong,
  4. Fusheng Chen,
  5. Yu-Ran Zhang,
  6. Yulin Wu,
  7. Yangsen Ye,
  8. Chen Zha,
  9. Shaowei Li,
  10. Shaojun Guo,
  11. Haoran Qian,
  12. He-Liang Huang,
  13. Jiale Yu,
  14. Hui Deng,
  15. Hao Rong,
  16. Jin Lin,
  17. Yu Xu,
  18. Lihua Sun,
  19. Cheng Guo,
  20. Na Li,
  21. Futian Liang,
  22. Cheng-Zhi Peng,
  23. Heng Fan,
  24. Xiaobo Zhu,
  25. and Jian-Wei Pan
Understanding various phenomena in non-equilibrium dynamics of closed quantum many-body systems, such as quantum thermalization, information scrambling, and nonergodic dynamics, is
a crucial for modern physics. Using a ladder-type superconducting quantum processor, we perform analog quantum simulations of both the XX ladder and one-dimensional (1D) XX model. By measuring the dynamics of local observables, entanglement entropy and tripartite mutual information, we signal quantum thermalization and information scrambling in the XX ladder. In contrast, we show that the XX chain, as free fermions on a 1D lattice, fails to thermalize, and local information does not scramble in the integrable channel. Our experiments reveal ergodicity and scrambling in the controllable qubit ladder, and opens the door to further investigations on the thermodynamics and chaos in quantum many-body systems.
arxiv pdf