Quantum Manipulation of Nuclear Spin of Ortho-H2 Molecule in Solid Hydrogen

固体氢中邻H2分子核自旋的量子操纵

基本信息

批准号：
15340131
负责人：
HAKUTA Kohzo
金额：
$ 10.56万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

We carried out the researches to establish a basis for manipulating nuclear-spin quantum-coherence of ortho-hydrogen molecule in solid hydrogen. Simultaneously, we developed a method to manipulate optical processes using optical nanofiber ; it was originally proposed to introduce a strong light into the solid hydrogen.Regarding the ortho-hydrogen project, we developed a highly-stable single-frequency cw laser at 2.4 μm wavelength using doubly-resonant OPO-technique. Ortho-hydrogen infrared transition (v=1-0, J=1-1) was measured systematically. We showed that the transition reveals an ultra-narrow spectral width of 1.6 MHz HWHM. This width is the narrowest width observed just using simple absorption spectroscopy, without using any nonlinear laser-spectroscopic method. Although density of ortho-hydrogen is very low 40 ppm, the peak absorption of 1-cm solid hydrogen crystal reaches to 60% ; it is due to the ultra-narrow spectral feature. We demonstrated also that the vibration-rotation sp … More ectrum splits into three components with splittings of about 10 MHz. The origin of the splitting may be understood due to breaking of magnetic degeneracy of J=1 state into three sublevels via crystal field. The observations have demonstrated that the ortho-hydrogen embedded in solid-parahydrogen is a unique system for realizing quantum coherence control in solid. The observed degeneracy breaking may open a new possibility to realize a new Raman three level scheme without magnetic field.Regarding the nanofiber, we established a method to produce nanofibers with diameter from 1μm to 400 nm with transmission of 80%. We showed theoretically a unique possibility to develop optical processes using nanofibers, very different from those in free space ; a key point is to confine both optical field and atoms/molecules into a submicron space around a nanofiber. We can manipulate single atom/molecule transition just using single photon. Moreover, spontaneous emission of atom/molecule near the nanofiber is strongly modified to emit photons into a guided mode of a nanofiber. We have observed experimentally the unique features of confinement in February of 2006. The observations imply that the nanofiber technique may open a new category of quantum optics. Less

我们进行了研究的基础，用于在固体氢中操纵正氢分子的核旋转量子量子。。非月光激光谱法是非常低的40 ppm，1 cm固体氢晶体的峰值吸收到60％，也呈现出振动旋转的SP…更多的分解成三个组成部分，分布量约为10 MHz。分裂的起源可能是通过恒星场将J = 1状态的磁性变性分解为三个级别的观测观察到的变性可能会打开一种新的可能性，以实现新的拉曼三个skeme Hout磁场。对纳米纤维进行了重新确定，我们建立了一种生产直径从1μm到400 nm的纳米纤维的方法，我们显示出80％的传播。使用纳米纤维的光学过程，非常不同的自由空间是将两个光场原子 /分子限制在纳米纤维周围的亚微米空间中。为了发射Ananofiber的Phototo Anto引导模式