Development of the and control of decoherence based on genetic algorithm

到目前为止，我们已经开发出一种称为APM的相位控制光源，用于在阿秒尺度上操纵物质的量子相，并成功地将APM应用于气相中孤立分子的超高精度相干控制。为了将这种相干控制应用于凝聚相，需要对退相干进行控制。退相干是系统与环境相互作用中相干性丧失的一种现象。它不仅从相干控制的观点来看很重要，而且从量子-经典边界的基本观点来看也很重要。人们还没有很好地理解，在原子和分子尺度的物质中很容易看到的相干性，是如何随着系统的复杂和庞大而变得很难看到的。本研究的目的是利用APM作为一种灵敏、定量的退相干检测器来检测和控制退相干。利用超短激光脉冲对碘分子产生的多孔进行强近红外激光脉冲辐照，积极诱导退相干。在这些实验中，我们观察到随着近红外激光脉冲的照射，波包的量子幅值有所降低。此外，我们还将APM应用于该系统，并观察到波包的量子相随着红外脉冲而移位。通过调整红外脉冲的时序和调制其光相位，可以控制这些幅值下降和相移。因此，我们成功地开发了一种退相干模拟器，将强近红外激光脉冲和APM相结合，应用于气相分子。除了这个&相干模拟器，我们已经开发了一个实验装置，类似的退相干模拟器将应用于在低温恒温器中制备的固体对氢中嵌入的碘分子。然而，我们还没有雇用；基于遗传算法的近红外激光退相干模拟器相位调制反馈控制。这些工作将在项目结束后继续进行。少

We have so far developed a phase-controlled light source called APM to manipulate quantum phases of matter on the attosecond scale, and have successfully applied APM to the coherent control of isolated molecules in the gas phase with an ultrahigh precision. In order to apply such coherent control to condensed phases, decoherence needs to be controlled. Decoherence is a phenomenon where coherence is lost in the interaction of the system with an environment. It is important not only from a viewpoint of coherent control but also from a fundamental point of view regarding the quantum-classical boundary. It is not yet understood very well how coherence, which is dearly seen in matter on the atomic and molecular scales, becomes difficult to be seen with the system being complex and large. The purpose of the present research is to test and control decoherence by using APM to serve as a sensitive and quantitative detector of decoherence.We have carried out experiments where vibrational wave pa … More ckets generated in the iodine molecules with an ultrashort laser pulse are irradiated with an intense near infrared laser pulse to actively induce decoherence. In these experiments, we have observed that the quantum amplitudes of the wave packets have been decreased with the irradiation of the near infrared laser pulse. Moreover we have applied APM to this system and have observed that quantum phases of the wave packets have been shifted with the infrared pulse. These amplitude-decrease and phase shift have been controlled by tuning the timing of the infrared pulse and by modulating its optical phase. We have thus succeeded in developing a decoherence simulator where intense near infrared laser pulses and APM are combined to be applied to the gas-phase molecules. Apart from this &coherence simulator, we have been developing an apparatus for the experiment where similar decoherence simulator will be applied to the iodine molecules embedded in a solid para-hydrogen prepared in a cryostat. We have not yet employed, however; a feedback control based on genetic algorithm to the phase modulation of the near infrared laser pulse of the decoherence simulator. These efforts will be continued after this project. Less