《科学前沿报告会》 第442期
科学前沿报告会(442) 


报告题目 
one component quantum mechanics and a universal leakage elimination operator 
报 告 人 
Lianao Wu, Ikerbasque Professor Department of Theoretical Physics, University of Basque Country UPV/EHU 
报告地点 
物理楼中楼215 
报告时间 
2018年11月19日（周一）上午 10:0011:00 
联 系 人 
何琼毅（qongyihe@pku.edu.cn） 
报告摘要 
We use a Feshbach PQ partitioning technique to derive a closed onecomponent integrodifferential equation. The resultant equation properly traces the footprint of the target state in quantum control theory. The physical significance of the derived dynamical equation is illustraed by both general analysis and concrete examples. Leakage from an encoded subspace to the rest of the system space is a particularly serious problem for which leakage elimination operators (LEOs) were introduced. By using the resultant dynamical equation, we show that the effectiveness of LEOs depends on the integral of the pulse sequence in the time domain, which has been missing because of the idealization of pulse sequences. Our results are applied to a threelevel system for the nitrogenvacancy centers under an external magnetic field and are illustrated by the fidelity dynamics of LEO sequences, ranging from regular rectangular pulses, random pulses, and even disordered (noisy) pulses.
报告人简介：Ikerbasque Professor in Department of Theoretical Physics and history of Science and Ikerbasque Foundation, The Basque Country University, Spain (October 2008present); Research Fields: quantum control, quantum information processing and devices; Researcher and Research Associate in Center for quantum information & quantum control, University of Toronto, Canada (October 2000October 2008); Associate, Full Professor in Theoretical Physics, Department of Physics, Jilin University, Chuangchun, China (19921999)
