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arXiv 1408.2162quant-ph
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基于非马尔可夫量子态扩散的三能级系统的Uhrig动力学控制

Uhrig Dynamical Control of a Three-Level System Via Non-Markovian Quantum State Diffusion

Wenchong Shu, Xinyu Zhao, Jun Jing, Lian-Ao Wu, Ting Yu

摘要:

本文利用量子态扩散(QSD)方程对耦合到无限个自由度的非马尔可夫库的三能级量子系统实现了Uhrig动力学解耦(UDD).为此,我们首先重新制定的非马尔可夫QSD纳入外部控制字段的效果。利用这种随机QSD方法,我们证明了当控制脉冲序列和控制算子被适当设计时,三能级量子系统的未知态可以普遍地被保护免受有色相位和振幅噪声的影响。使用非马尔可夫量子态扩散方程的优点是,即使在无限自由度的环境下,也可以精确地处理开放量子系统的控制动力学,而不需要使用Trotter乘积公式。我们还展示了控制效果如何依赖于环境记忆时间和所设计的施加控制脉冲的时间点。

英文摘要:

In this paper, we use the quantum state diffusion (QSD) equation to implement the Uhrig dynamical decoupling (UDD) to a three-level quantum system coupled to a non-Markovian reservoir comprising of infinite numbers of degrees of freedom. For this purpose, we first reformulate the non-Markovian QSD to incorporate the effect of the external control fields. With this stochastic QSD approach, we demonstrate that an unknown state of the three-level quantum system can be universally protected against both colored phase and amplitude noises when the control-pulse sequences and control operators are properly designed. The advantage of using non-Markovian quantum state diffusion equations is that the control dynamics of open quantum systems can be treated exactly without using Trotter product formula and be efficiently simulated even when the environment comprise of infinite numbers of degrees of freedom. We also show how the control efficacy depends on the environment memory time and the designed time points of applied control pulses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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