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Acta Sinica Quantum Optica

Atomic Squeezing Properties of Bose-Einstein Condensate in Electromagnetically Induced Transparency

Zeng Ai-hua

Published Jan 1, 2005• 0 citations
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Abstract

In this paper atomic squeezing properties of Bose-Einstein Condensate in electromagnetically induced transparency are studied analytically and numerically. The dependence of single-mode squeezing and two-mode squeezing on the parameters is investigated in detail. It is found that the degree of single-mode squeezing can be enhanced by increasing the initial intensity of the field in this mode and decreasing the interaction between two modes and that of two-mode squeezing can be enhanced by increasing the initial intensity in both modes and the interaction between two modes.

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Acta Physica Sinica•Jan 1, 2014•2 citations
In this paper atomic squeezing properties of Bose-Einstein Condensate in electromagnetically induced transparency are studied analytically and numerically. The dependence of single-mode squeezing and two-mode squeezing on the parameters is investigated in detail. It is found that the degree of single-mode squeezing can be enhanced by increasing the initial intensity of the field in this mode and decreasing the interaction between two modes and that of two-mode squeezing can be enhanced by increasing the initial intensity in both modes and the interaction between two modes.
The Hamiltonian operator of two-mode light field interacting with Bose-Einstein condensate(BEC) of two-level atoms is improved in terms of the lattice-liquid model,and the squeezing properties of two-mode squeezed field interacting with Bose-Einstein condensate of two-level atoms are studied.The results show that two quadrature components of light can be squeezed periodically,the maximum depth of squeezing is closely correlated to the initial squeezing parameter of light,and the duration is determined by the frequency of the light field.
The Hamiltonian operator of a system of two-level atomic Bose-Einstein condensate interacting with two-mode squeezed coherent light field is improved in terms of the lattice-liquid model. The squeezing properties of atom laser in this system are studied. Results show that the two quadrature components of the atom laser can be squeezed periodically, and the maximum depth depends greatly on the initial squeezing factor of the light field. The collapse-revival oscillatory frequency of the atom laser and the quantum Rabi frequency are largely determined by the interaction intensity between the light field and the atoms and by the circle frequency of the light field, respectively.
We propose a scheme to coherently control spin squeezing of atomic Bose-Einstein condensate (BEC) via the technique of electromagnetically induced transparency (EIT). We study quantum dynamics of the mean spin vector and spin squeezing. It is shown that the mean spin vector and spin squeezing of the BEC can be controlled and manipulated by adjusting the external coupling fields or/and internal nonlinear interactions of the BEC. It is indicated that the spin squeezing can be generated rapidly in the dynamical process and maintained in a long time interval. It is found that a larger effective Rabi coupling between atoms and lasers can produce a stronger spin squeezing, and the squeezing can maintain a longer time interval.
The squeezing properties of the two-mode atom laser in a system of Ξ-type three-level atomic Bose-Einstein condensate interacting with single-mode squeezed coherent light field are studied. The results show that the two-mode atom laser can be squeezed periodically, and has two types of oscillations: quantum Rabi oscillation and collapse-revival oscillation. The maximum depth of squeezing and the collapse-revival frequency of the atom laser depend greatly on the interaction intensity between the light field and atoms, and the quantum Rabi frequency is largely determined by the frequency of the light field.