Laser Cooling and Fundamental Physics

激光冷却和基础物理

• 批准号: 11216203
• 负责人: YABUZAKI Tsutomu
• 金额: $ 85.18万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11216203/
• 关键词: LASER COOLING; YTTERBIUM; BEC; QUANTUM NONEDEMOLITON; LIQUID HELIUM; DIPOLE FORCE; BOSON; FERMION; 基礎物理; 時間反転対称性; ボース・アインシュタイン凝縮; スピン量子非破壊測定; 量子統計性; スピン精密制御; ボーズ・アインシュタイン凝縮

The ultimate goal of the research project of the A2 group was to verify fundamental laws of physics by using laser cooled atoms. For this purpose Yabuzaki et al worked on the laser cooling and trapping of Yb atoms, improvement of RB Bose condensates, and theoretical work on the quantum non-demolition measurements. On the Yb cooling program, they achieved (1) trapping of ultra- cold Yb atoms in a magneto-optical trap, (2) realization of the Yb atomic trap of ultra-high luminocity, (3) observation of cooperative cooling in the mixture of bosonic and fermionic Yb atoms, (4) highly efficient cooling in an optical dipole trap, (5) generation of ultra-cold Yb molecules by photoassociation, (6) the first non-degenerate BEC of Yb atoms. On the rubidium program, they succeeded generating stable BEC within few seconds of evaporative cooling by transferring cooled Rb atoms into a crossed-beam optical dipole trap of a carbon dioxide laser. Further, they study physics that brings an unexpectedly high density in optical dipole trap. Morita's group was the first to trap metastable He-3 in the world. They study collision dynamics of ultracold He-4 and He-3 atoms. They solved me mechanism that makes the collision cross section of He-3 larger than that of He-4, Kitano et al studied anti-quantum Zeno effect and the propagation of light through a medium with negative group velocity.

A2小组研究项目的最终目标是通过激光冷却原子来验证物理的基本定律。为此，Yabuzaki等人进行了Yb原子的激光冷却和俘获、RB玻色凝聚体的改进以及量子非拆除测量的理论工作。在Yb的冷却方案上，他们实现了(1)在磁光阱中捕获超冷的Yb原子，(2)实现了超高亮度的Yb原子阱，(3)观察到玻色子和费米子Yb原子混合中的协同冷却，(4)在光学偶极子阱中高效冷却，(5)通过光缔合产生超冷的Yb分子，(6)第一个Yb原子的非简并BEC。在铷项目中，他们通过将冷却的铷原子转移到二氧化碳激光器的交叉光束光学偶极子阱中，在蒸发冷却的几秒钟内成功地产生了稳定的BEC。此外，他们还研究了在光学偶极子阱中产生意想不到的高密度的物理学。森田的团队是世界上第一个捕获亚稳态He-3的团队。他们研究了超冷氦-4和氦-3原子的碰撞动力学。他们解决了使He-3的碰撞截面大于He-4的机制，Kitano等研究了反量子芝诺效应和光在负群速介质中的传播。

项目成果

K. Honda, Y. Takasu, T. Kuwamoto, M. Kumakura, Y. Takahasni and T. Yabuzaki: "Optical dipole force trapping of a fermion-boson mixture of ytterbium isotopes"Phys. Rev. A. 66(2). 021401-1-4(R) (2002)

K. Honda、Y. Takasu、T. Kuwamoto、M. Kumakura、Y. Takahasni 和 T. Yabuzaki：“镱同位素的费米子-玻色子混合物的光学偶极力捕获”Phys。

K.Honda: "Optical dipole force trapping of a fermion-boson mixture of ytterbium isotopes"Phys.Rev. A. 66・2. 021401-1-021401-4(R) (2002)

K.Honda：“镱同位素的费米子-玻色子混合物的光学偶极力捕获”Phys.Rev.A. 021401-1-021401-4(R) (2002)

A Hatakeyama: "Slow spin relaxation of Rb atoms confined in a glass cell"Phys.Rev.Lett.. 84. 1407-1410 (2000)

A Hatakeyama：“限制在玻璃池中的 Rb 原子的缓慢自旋弛豫”Phys.Rev.Lett.. 84. 1407-1410 (2000)

K. Ishikawa: "Visualization of foreign atoms by optical magnetic-resonance imaging of Cs atoms"J. Opt. Soc. Am.. 17. 182-187 (2000)

K. Ishikawa：“通过 Cs 原子的光学磁共振成像实现外来原子的可视化”J。

K. Honda: "Magnet-optical trapping of Yb atoms and a limit on the branching ratio of the 1P1 state"Phys. Rev.. A. R934-R937 (1999)

K. Honda：“Yb 原子的磁光捕获和 1P1 态支化比的限制”Phys。