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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

我们开展的研究是为操纵固体氢中邻氢分子的核自旋量子相干性奠定基础。同时，我们开发了一种使用光学纳米纤维操纵光学过程的方法；最初提出将强光引入固体氢。关于正交氢项目，我们利用双谐振OPO技术开发了波长2.4μm的高稳定单频连续激光器。系统测量了邻氢红外跃迁（v=1-0，J=1-1）。我们证明该跃迁揭示了 1.6 MHz HWHM 的超窄谱宽。该宽度是仅使用简单吸收光谱观察到的最窄宽度，而不使用任何非线性激光光谱方法。尽管原氢的密度很低，只有40 ppm，但1厘米固体氢晶体的吸收峰却达到60%；这是由于超窄光谱特征。我们还证明了振动旋转 sp 分裂成三个分量，分裂频率约为 10 MHz。分裂的起源可以理解为J=1态的磁简并性通过晶体场分裂成三个子能级。观察结果表明，嵌入固体仲氢中的邻氢是实现固体量子相干控制的独特系统。观察到的简并断裂可能为实现新的无磁场拉曼三能级方案开辟了新的可能性。对于纳米纤维，我们建立了一种生产直径从1μm到400 nm、透射率为80%的纳米纤维的方法。我们从理论上展示了使用纳米纤维开发光学过程的独特可能性，这与自由空间中的光学过程非常不同；关键点是将光场和原子/分子限制在纳米纤维周围的亚微米空间内。我们可以仅使用单个光子来操纵单个原子/分子的跃迁。此外，纳米纤维附近原子/分子的自发发射被强烈修改，以将光子发射到纳米纤维的引导模式中。 2006年2月，我们通过实验观察到了约束的独特特征。这些观察结果表明，纳米纤维技术可能会开启量子光学的新类别。较少的