Effects of imperfect pulses on dynamical decoupling using quantum trajectory method  

作　　者：Lin-Ze He Man-Chao Zhang Chun-Wang Wu Yi Xie Wei Wu Ping-Xing Chen 何林泽;张满超;吴春旺;谢艺;吴伟;陈平形

机构地区：[1]Department of Physics,College of Science and Liberal Arts,National University of Defense Technology,Changsha 410073,China [2]interdisciplinary Center for Quantum Information,National University of Defense Technology,Changsha 410073,China [3]State Key Laboratory of High Performance Computing,National University of Defense Technology,Changsha 410073,China

出　　处：《Chinese Physics B》2018年第12期182-188,共7页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2016YFA0301903);the National Natural Science Foundation of China(Grant Nos.11174370,11304387,61632021,11305262,and 61205108);the Research Plan Project of the National University of Defense Technology(Grant No.ZK16-03-04)

摘　　要：The dynamical decoupling(DD) method is widely adopted to preserve coherence in different quantum systems. In the case of ideal pulses, its effects on the suppression of noise can be analytically described by the mathematical form of filter function. However, in practical experiments, the unavoidable pulse errors limit the efficiency of DD. In this paper,we study the effects of imperfect pulses on DD efficiency based on quantum trajectories. By directly generating a pseudo noise sequence correlated in time, we can explore the performance of DD with different pulse errors in the typical noise environment. It shows that, for the typical 1/f noise environment, the phase error of operational pulses severely affects the performance of noise suppression, while the detuning and intensity errors have less influence. Also, we get the thresholds of these errors for efficient DD under the given experimental conditions. Our method can be widely applied to guide practical DD experimental implementation.The dynamical decoupling(DD) method is widely adopted to preserve coherence in different quantum systems. In the case of ideal pulses, its effects on the suppression of noise can be analytically described by the mathematical form of filter function. However, in practical experiments, the unavoidable pulse errors limit the efficiency of DD. In this paper,we study the effects of imperfect pulses on DD efficiency based on quantum trajectories. By directly generating a pseudo noise sequence correlated in time, we can explore the performance of DD with different pulse errors in the typical noise environment. It shows that, for the typical 1/f noise environment, the phase error of operational pulses severely affects the performance of noise suppression, while the detuning and intensity errors have less influence. Also, we get the thresholds of these errors for efficient DD under the given experimental conditions. Our method can be widely applied to guide practical DD experimental implementation.

关 键 词：pulse imperfections dynamical decoupling 

分 类 号：O4[理学—物理]