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Professor
Yu, Ite Albert

 
Personal Website
Office¡G886-3-5742539 (PHYS R513)
Laboratory¡GUltracold Atom Laboratoryb
Lab Tel¡G886-3-5742540 (PHYS R012)
Fax¡G886-3-5723052
E-mail¡Gyu@phys.nthu.edu.tw

Education
  1. 1987-1993 Ph.D in Physics, Massachusetts Institute of Technology, U.S.A.
  2. 1980-1984 B.S. in Physics, National Tsing Hua University, R.O.C.
Professional Experience
Current position¡G
  1. 2005-present, Professor of Physics, Tsing Hua University, R.O.C.
Experience¡G
  1. 1995-2005, Associate Professor of Physics, Tsing Hua University, R.O.C..
  2. 1993-1995, Postdoctral Researcher of Harvard-Smithsonian Center for Astrophysics,U.S.A.
Research Fields
    1. Experiments and Theories of Atomic and Molecular Physics
    2. Laser Cooling and Trapping
    3. Bose-Einstein Condensation
    4. Quantum Optics
    5. Quantum Information
Research Interests and achievement
Updated on December 1, 2009
We utilize laser-cooled atoms and Bose condensates for the studies of the electromagnetically induced transparency (EIT) effect, slow light, storage of light, stationary light and low-light-level nonlinear optics.

The major progresses in recent years are listed below. (1) We proposed and experimentally demonstrated a new scheme of low-light-level cross-phase modulation (XPM) based on the light-storage technique. With this scheme, we obtained a phase shift of 44 degrees of the probe pulse by employing a very weak signal pulse of the energy level of 6 photons per atomic cross section. Our scheme enhances the flexibility of the experiment and makes possible conditional phase shifts of 180 degrees with single photons. One can utilize the single-photon XPM in the applications of quantum nondemolition measurements, quantum phase gates, and the manipulation of quantum information. See PRL 96, 043603 (2006) for details. (2) We successfully achieved Bose-Einstein condensation (BEC) condensate of Rb-87 atoms. The transition temperature is 250 nK at a density of around 1014 cm-3. The weakly-interacting, high-density, and coherent Bose condensate formed in the BEC transition provides an excellent system for the single-photon experiments. See Optics Express 15, 12114 (2007) for details. (3) We successfully produced stationary light pulses (SLPs), e.g., light pulses without motion, in cold atomic media. The experimental result is equivalent to trap a light pulse in an optical cavity with a Q factor of 109. As SLPs significantly increase the interaction time between light and matter, this work opens a new avenue in low-light-level nonlinear optics and quantum information manipulation. See PRL 102, 213601 (2009) for details.
Selected Publications
  1. [2009] Y. W. Lin, W. T. Liao, T. Peters, H. C. Chou, J. S. Wang, H. W. Cho, P. C. Kuan, and I. A. Yu, Stationary Light Pulses in Cold Atomic Media and without Bragg Gratings, Phys. Rev. Lett. 102, 213601 (2009).
  2. [2008] Y. W. Lin, H. C. Chou, P. P. Dwivedi, Y. C. Chen, and I. A. Yu, Using a pair of rectangular coils in the MOT for the production of cold atom clouds with large optical density, Opt. Express 16, 3753 (2008).
  3. [2007] H. W. Cho, Y. C. He, T. Peters, Y. H. Chen, H. C. Chen, S. C. Lin, Y. C. Lee, and I. A. Yu, Direct measurement of the atom number in a Bose condensate, Opt. Express 15, 12114 (2007).
  4. [2006] C. Y. Wang, Y. F. Chen, S. C. Lin, and I. A. Yu, Low-light-level all-optical switching, Opt. Lett. 31, 2350 (2006).
  5. [2006] Y. F. Chen, C. Y. Wang, S. H. Wang, and I. A. Yu, Low-Light-Level Cross-Phase Modulation Based on Stored Light Pulses, Phys. Rev. Lett. 96, 043603 (2006).
  6. [2005] Y. F. Chen, Z. H. Tsai, Y. C. Liu, and I. A. Yu, Low-light-level photon switching by quantum interference, Opt. Lett. 30, 3207 (2005).

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