The progress in the quantum coherent controlling of chemical reactions is briefly reviewed. The controlling was firstly realized by modulating the phasa angle between one photon and three photon excitation of some mol...The progress in the quantum coherent controlling of chemical reactions is briefly reviewed. The controlling was firstly realized by modulating the phasa angle between one photon and three photon excitation of some molecules. The fluorescence intensities of atom in gaseous phase or molecules in liquid phase, as well as the dissociation branching of molecules were also controlled by self optimizing the phase and the amplitude of an ultrafast laser pules. Some new possible propress of coherent control may appearin strong laser field, in condense phase or on catalysts.展开更多
文献[Quantum Information and Computation,2005,5(4):350-363]提出量子相干性跟踪控制策略以保持量子位的相干性,该策略本质是开环控制,而开环控制的缺陷就是严重依赖于精确地了解系统的初始条件和模型参数。然而,我们对于系统的知识...文献[Quantum Information and Computation,2005,5(4):350-363]提出量子相干性跟踪控制策略以保持量子位的相干性,该策略本质是开环控制,而开环控制的缺陷就是严重依赖于精确地了解系统的初始条件和模型参数。然而,我们对于系统的知识总是存在不确定性的。本文从鲁棒性的角度分析了量子相干性跟踪控制策略的局限性。首先,我们对该方法的鲁棒性进行了理论分析;接着用仿真实例定量说明了:量子初始条件和模型参数的精度对保持相干性的影响。根据相干性的精度要求,我们可以利用仿真分析的手段,来确定对模型参数和初始状态必须满足的精度条件。总之,我们在应用中必须谨慎采用量子相干性跟踪控制策略。展开更多
文摘The progress in the quantum coherent controlling of chemical reactions is briefly reviewed. The controlling was firstly realized by modulating the phasa angle between one photon and three photon excitation of some molecules. The fluorescence intensities of atom in gaseous phase or molecules in liquid phase, as well as the dissociation branching of molecules were also controlled by self optimizing the phase and the amplitude of an ultrafast laser pules. Some new possible propress of coherent control may appearin strong laser field, in condense phase or on catalysts.
文摘文献[Quantum Information and Computation,2005,5(4):350-363]提出量子相干性跟踪控制策略以保持量子位的相干性,该策略本质是开环控制,而开环控制的缺陷就是严重依赖于精确地了解系统的初始条件和模型参数。然而,我们对于系统的知识总是存在不确定性的。本文从鲁棒性的角度分析了量子相干性跟踪控制策略的局限性。首先,我们对该方法的鲁棒性进行了理论分析;接着用仿真实例定量说明了:量子初始条件和模型参数的精度对保持相干性的影响。根据相干性的精度要求,我们可以利用仿真分析的手段,来确定对模型参数和初始状态必须满足的精度条件。总之,我们在应用中必须谨慎采用量子相干性跟踪控制策略。
基金Supported by the National Natural Science Foundation of China (60774098)the National Key Basic Research Program (2006CB922004)the USTC Initiative Foundation (KD2007045)
