Jing Jun, Bishop C Allen, Wu Lian-Ao
1] Institute of Atomic and Molecular Physics, Jilin University, Chuangchun 130012, Jilin, China [2] Department of Theoretical Physics and History of Science, The Basque Country University (EHU/UPV), PO Box 644, 48080 Bilbao Spain.
Qubitekk Inc., San Diego, CA 92081, USA.
Sci Rep. 2014 Aug 29;4:6229. doi: 10.1038/srep06229.
Parametric fluctuations or stochastic signals are introduced into the rectangular pulse sequence to investigate the feasibility of random dynamical decoupling. In a large parameter region, we find that the out-of-order control pulses work as well as the regular pulses for dynamical decoupling and dissipation suppression. Calculations and analysis are enabled by and based on a nonperturbative dynamical decoupling approach allowed by an exact quantum-state-diffusion equation. When the average frequency and duration of the pulse sequence take proper values, the random control sequence is robust, fault-tolerant, and insensitive to pulse strength deviations and interpulse temporal separation in the quasi-periodic sequence. This relaxes the operational requirements placed on quantum control devices to a great deal.
将参数涨落或随机信号引入矩形脉冲序列，以研究随机动力学解耦的可行性。在一个较大的参数区域内，我们发现无序控制脉冲在动力学解耦和抑制耗散方面与常规脉冲效果相同。计算和分析是通过一个由精确量子态扩散方程允许的非微扰动力学解耦方法进行的，并基于该方法。当脉冲序列的平均频率和持续时间取适当值时，随机控制序列具有鲁棒性、容错性，并且对准周期序列中的脉冲强度偏差和脉冲间时间间隔不敏感。这大大放宽了对量子控制设备的操作要求。
