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Quantum memory using hyperfine structure of atoms : We study a novel type of quantum memory based on electromagnetically induced transparency (EIT) using the ground-state hyperfine structure of neutral atoms.
Topics include four-wave parametric fluorescence and oscillation by resonant, counter-propagating pumping, optical data storage using EIT, and so on. Experiments are performed by using either a hot atomic vapor (Figure 1) or a laser-cooled Na atom cloud at 200 micro-Kelvin.
Nonlinear spectroscopy by quantum interference effect : Compact atomic clocks based on EIT along with sensitive magnetic-field measurement are investigated. In the presence of a static magnetic field, Zeeman EIT and hyperfine EIT are simultaneously measured for the ground-state hyperfine splitting of neutral Na atoms.
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Figure 1. Quantum interference experiment using Na vapor |
Figure 2. Laser-cooled Na atom cloud |
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