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4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다

아 래

제목: Three magics to hold an atom without perturbation

연사: 조   동   현 교수님 (고려대학교)

일시: 2011년 5월 18(수) 오후4:30

장소: e+첨단강의실 (31214호실)

초록: Trapped atoms with long interrogation time provide excellent sample for both spectroscopy an uantum information processing (QIP). Potential well of a trap, however, perturbs internal state of toms as well as holding them. Even in an optical trap, which is least perturbative
among  various raps, systematic shift and inhomogeneous broadening of a transition seriously limit its utility as a tool in spectroscopy and QIP. We will report some of the tricks developed to overcome this difficulty.
For a transition in an optical frequency domain, magic wavelength using three-level system has been emonstrated for cesium and ytterbium atoms.

We have proposed magic power for a pulsed optical rap, which can result in a perturbation-free spectroscopy of a transition in an optical frequency
omain. The idea is applicable to a general two-level system and we carried out a proof-of-principle experiment using cesium atoms. For a hyperfine

transition of a ground-state alkali metal atoms, dual beam optical trap and spin-echo have been tried to overcome the inhomogeneous broadening
with a limited success. Recently we proposed the idea of magic polarization, where difference in he scalar polarizabilities of the two hyperfine levels

is compensated by the vector polarizabilities.With a proper polarization of th trapping beam, the vector term can be tuned to eliminate the ystematic
shift  and  the inhomogeneous broadening of a microwave transition. We will report our progress in the magic polarization experiment using lithium

atoms.