中国物理B ›› 2018, Vol. 27 ›› Issue (12): 120303-120303.doi: 10.1088/1674-1056/27/12/120303

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Effects of imperfect pulses on dynamical decoupling using quantum trajectory method

Lin-Ze He(何林泽), Man-Chao Zhang(张满超), Chun-Wang Wu(吴春旺), Yi Xie(谢艺), Wei Wu(吴伟), Ping-Xing Chen(陈平形)   

  1. 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
  • 收稿日期:2018-07-23 修回日期:2018-10-18 出版日期:2018-12-05 发布日期:2018-12-05
  • 通讯作者: Ping-Xing Chen E-mail:pxchen@nudt.edu.cn
  • 基金资助:

    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), and the Research Plan Project of the National University of Defense Technology (Grant No. ZK16-03-04).

Effects of imperfect pulses on dynamical decoupling using quantum trajectory method

Lin-Ze He(何林泽)1,2,3, Man-Chao Zhang(张满超)1,2,3, Chun-Wang Wu(吴春旺)1,2,3, Yi Xie(谢艺)1,2,3, Wei Wu(吴伟)1,2,3, Ping-Xing Chen(陈平形)1,2,3   

  1. 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
  • Received:2018-07-23 Revised:2018-10-18 Online:2018-12-05 Published:2018-12-05
  • Contact: Ping-Xing Chen E-mail:pxchen@nudt.edu.cn
  • Supported by:

    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), and 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.

关键词: pulse imperfections, dynamical decoupling

Abstract:

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.

Key words: pulse imperfections, dynamical decoupling

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
03.67.Pp (Quantum error correction and other methods for protection against decoherence) 02.60.-x (Numerical approximation and analysis)