Development of the and control of decoherence based on genetic algorithm

基于遗传算法的退相干控制的发展

• 批准号: 18340121
• 负责人: OHMORI Kenji
• 金额: $ 10.21万
• 依托单位: Institute for Molecular Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18340121/
• 关键词: wave packet; attosecond; coherent control; decoherence; genetic algorithm; femtosecond; quantum; laser

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

到目前为止，我们已经开发了一种名为APM的相控光源，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相干控制，精度达到了100%。为了将这种相干控制应用于凝聚相，需要控制退相干。退相干是一种系统在与环境的相互作用中失去相干性的现象。它不仅从相干控制的观点来看是重要的，而且从关于量子-经典边界的基本观点来看也是重要的。人们还不太清楚，为什么在原子和分子尺度上的物质中清晰可见的相干性，在复杂和庞大的系统中变得难以看到。本研究的目的是利用APM作为一种灵敏的、定量的退相干检测器来检测和控制退相干， ...更多信息 用超短激光脉冲在碘分子中产生的碎片用强近红外激光脉冲照射以主动诱导退相干。在这些实验中，我们观察到波包的量子振幅随着近红外激光脉冲的照射而减小。此外，我们还将APM应用到该系统中，观察到波包的量子相位随红外脉冲的移动而发生了变化。这些振幅的减少和相移已被控制通过调整红外脉冲的定时和通过调制其光学相位。因此，我们成功地开发了一个退相干模拟器，其中强近红外激光脉冲和APM相结合，以施加到气相分子。除了这个和相干模拟器，我们一直在开发一种装置的实验中，类似的退相干模拟器将被应用到碘分子嵌入在一个低温恒温器中制备的固体仲氢。然而，对于退相干模拟器中近红外激光脉冲的相位调制，我们还没有采用基于遗传算法的反馈控制。这些努力将在该项目结束后继续进行。少

项目成果

「研究成果報告書概要(和文)」より

摘自《研究结果报告摘要（日文）》

• 发表时间: 2005
• 作者: Kawauchi;et. al.;Nishimura et al.;Dezawa et al.;Yoshizawa et al.;星野 幹雄;星野 幹雄
• 通讯作者: 星野 幹雄

Controlling wave-packet interference with attosecond precisions

以阿秒精度控制波包干扰

• 发表时间: 2008
• 期刊: Review of Laser Engineering ; the membership journal (in Japanese) of the Laser Society of Japan 36
• 作者: H. Katsuki;K Ohmori
• 通讯作者: K Ohmori

Visualizing and Controlling Picometdc Quantum Ripples in Molecules

分子中皮克量子波纹的可视化和控制

• 发表时间: 2008
• 作者: H. Katsuki;K. Hosaka;H. Chiba;K. Ohmori;K.Ohmori;K Ohmori;K. Ohmori;Kenji Ohmori;大森 賢治;大森 賢治;Kenji Ohmori;Kenji Ohmori;Kenji Ohmori;Kenji Ohmori;Hiroyuki Katsuki;Hiroyuki Katsuki;Kenji Ohmori;Hiroyuki Katsuki;Kenji Oluncei;Kenji Ohmori
• 通讯作者: Kenji Ohmori

アト秒精度の波束干渉を用いた振動波東の制御と観測

利用阿秒级精确的波包干涉控制和观察振荡波

• 发表时间: 2007
• 作者: H. Katsuki;K. Hosaka;H. Chiba;K. Ohmori;K.Ohmori;K Ohmori;K. Ohmori;Kenji Ohmori;大森 賢治;大森 賢治;Kenji Ohmori;Kenji Ohmori;Kenji Ohmori;Kenji Ohmori;Hiroyuki Katsuki;Hiroyuki Katsuki;Kenji Ohmori;Hiroyuki Katsuki;Kenji Oluncei;Kenji Ohmori;Kenji Ohmori;香月 浩之
• 通讯作者: 香月 浩之

アト秒精度の波束干渉を用いた振動波束の制御と観測

利用阿秒精度波包干涉控制和观测振荡波包

• 发表时间: 2007
• 作者: 中山耕輔;久保田正人;他;香月浩之
• 通讯作者: 香月浩之