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Propagation of Light in an Ensemble of Tripod Level Atoms

Communications in Theoretical Physics 2006年第1X期46卷 135-140页

作者： LI Yong Institute of Theoretical Physics the Chinese Academy of Sciences Beijing 100080 China Interdisciplinary Center of Theoretical Studies the Chinese Academy of Sciences Beijing 100080 China Department of Physics Hunan Normal University Changsha 410081 China

We study the propagation of a quantum probe light in an ensemble of tripod level atoms when the atoms are coupled to two other classical control fields. First we calculate the dispersion properties, such as susceptibility and group velocity, of the probe light within such an atomic medium under the case of three-photon resonance via the dynamical algebra method of collective atomic excitations. Then we calculate the dispersion of the probe light in the case that two classical control fieMs have the different detunings to the relative atomic transitions. Our results show that in both cases the phenomenon of electromagnetically induced transparency can occur. Especially under the second case, we can find two transparency windows for the probe light.

关键词： group velocity collective excitation electromagnetically induced transparency

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Perfect Transfer of Many-Particle Quantum State via High-Dimensional Systems with Spectrum-Matched Symmetry

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Communications in Theoretical Physics 2007年第3X期48卷 445-448页

作者： LI Ying SONG Zhi SUN Chang-Pu Department of Physics The Key Lab of Weak Light Nonlinear Photonics Ministry of Education Nankai University Tianjin 300071 China Institute of Theoretical Physics the Chinese Academy of Sciences Beijing 100080~ China

The quantum state transmission through the medium of high-dimensional many-particle system （boson or spinless fermion） is generally studied with a symmetry analysis. We discover that, if the spectrum of a Hamiltonian matches the symmetry of a fermion or boson system in a certain fashion, a perfect quantum state transfer can be implemented without any operation on the medium with pre-engineered nearest neighbor （NN）. We also study a simple but realistic near half-filled tight-bindlng fermion system wlth uniform NN hopping integral. We show that an arbitrary many-particle state near the fermi surface can be perfectly transferred to its translational counterpart.

关键词： high-dimensional many-particle system perfect quantum state transfer

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