中国物理B ›› 2019, Vol. 28 ›› Issue (6): 60201-060201.doi: 10.1088/1674-1056/28/6/060201
• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 下一篇
Simulation of the influence of imperfections on dynamical decoupling of a superconducting qubit
Ying-Shan Zhang(张颖珊), Jian-She Liu(刘建设), Chang-Hao Zhao(赵昌昊), Yong-Cheng He(何永成), Da Xu(徐达), Wei Chen(陈炜)
- 1 Department of Microelectronics and Nanoelectronics, Tsinghua University, Beijing 100084, China;
2 Institute of Microelectronics, Tsinghua University, Beijing 100084, China;
3 Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China
Simulation of the influence of imperfections on dynamical decoupling of a superconducting qubit
Ying-Shan Zhang(张颖珊), Jian-She Liu(刘建设), Chang-Hao Zhao(赵昌昊), Yong-Cheng He(何永成), Da Xu(徐达), Wei Chen(陈炜)
- 1 Department of Microelectronics and Nanoelectronics, Tsinghua University, Beijing 100084, China;
2 Institute of Microelectronics, Tsinghua University, Beijing 100084, China;
3 Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China
摘要：
Dynamical decoupling is widely used in many quantum computing systems to combat decoherence. In a practical superconducting quantum system, imperfections can plague decoupling performance. In this work, imperfections in a superconducting qubit and its control system are modeled via modified Hamiltonian and collapse operator. A master equation simulation is carried out on the qubit under 1/f environment noise spectrum. The average dephasing rate of qubit is extracted to characterize the impact of different imperfections on the decoupling from dephasing. We find that the precision of pulse position, on-off ratio, and filtering effect are most critical. Bounded pulses have weaker impact, while variation in pulse width and qubit relaxation are insignificant. Consequently, alternative decoupling protocols, jitter mitigation, cascaded mixers, and pulse shaping can be conducive to the performance of decoupling. This work may assist the analysis and optimization of dynamical decoupling on noisy superconducting quantum systems.
中图分类号: (Control theory)
- 02.30.Yy