arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.04211math.OCmath-phmath.MPmath.PRquant-ph
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N能级量子自旋系统的鲁棒反馈镇定

Robust feedback stabilization of N-level quantum spin systems

Weichao Liang, Nina H. Amini, Paolo Mason

摘要:

本文研究了N能级量子角动量系统与连续时间测量的电磁场相互作用。我们假设不知道的初态和物理参数,需要引入一个额外的状态表示估计的量子态。量子态的演化及其估计由一个耦合的随机主方程描述。在这里,我们研究这样的系统的存在下的反馈控制器的渐近行为。我们提供了充分条件的反馈控制器和估计的参数,保证指数稳定的耦合随机系统对本征态的测量运营商。此外,我们估计相应的收敛速率。我们还提供了满足这些条件的参数化反馈法。我们的结果表明,在[21]中考虑的反馈镇定策略的鲁棒性的估计状态的不精确的初始化的情况下,相对于未知的物理参数。

英文摘要:

In this paper, we consider N-level quantum angular momentum systems interacting with electromagnetic fields undergoing continuous-time measurements. We suppose unawareness of the initial state and physical parameters, entailing the introduction of an additional state representing the estimated quantum state. The evolution of the quantum state and its estimation is described by a coupled stochastic master equation. Here, we study the asymptotic behavior of such a system in presence of a feedback controller. We provide sufficient conditions on the feedback controller and on the estimated parameters that guarantee exponential stabilization of the coupled stochastic system towards an eigenstate of the measurement operator. Furthermore, we estimate the corresponding rate of convergence. We also provide parametrized feedback laws satisfying such conditions. Our results show the robustness of the feedback stabilization strategy considered in [21] in case of imprecise initialization of the estimated state and with respect to the unknown physical parameters.

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