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Acta Optica Sinica

Squeezing Properties of Two-Mode SU (1,1) Coherent States Interacting with Bose-Einstein Condensate of V-Type Three-Level Atoms

赵建刚 Zhao Jiangang, 孙长勇 Sun Changyong, 闫丽华 Yan Lihua

Published Jan 1, 2009• 0 citations
Publisher

Abstract

在双模SU(1,1)相干态光场和V-型三能级原子玻色-爱因斯坦凝聚体相互作用系统中, 应用全量子理论, 在旋波近似下, 研究了双模光场的压缩特性, 分别讨论了光场与原子之间的耦合常数、原子之间的相互作用和光场参数对光场压缩特性的影响。研究表明, 光场的两个正交分量均被周期性压缩, 光场与原子的耦合系数和原子间的相互作用强度增大时均使得光场正交分量涨落的周期缩短; 光场参数的变化不影响光场压缩的周期, 对压缩深度有一定的影响。

DOI
10.3788/aos20092907.2006

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在双模SU(1,1)相干态光场和V-型三能级原子玻色-爱因斯坦凝聚体相互作用系统中, 应用全量子理论, 在旋波近似下, 研究了双模光场的压缩特性, 分别讨论了光场与原子之间的耦合常数、原子之间的相互作用和光场参数对光场压缩特性的影响。研究表明, 光场的两个正交分量均被周期性压缩, 光场与原子的耦合系数和原子间的相互作用强度增大时均使得光场正交分量涨落的周期缩短; 光场参数的变化不影响光场压缩的周期, 对压缩深度有一定的影响。
The quantum properties and amplitude-squared squeezing effects of light field are studied in the system of two-mode SU(1,1) coherent states interacting with Bose-Einstein Condensate of V-type three-level atoms,and the squeezing properties of atomic laser have also been discussed.The results show that the quantum correlation properties of light field keep invariant in the process of interaction between light field and atomic BEC,and the photons of each mode produce antibunching effect.The correlation between the two modes shows the non-classical correlation in the process of interaction.There are amplitude-squared squeezing effects in these quantum states.The influence of field parameter and atom parameter on the depth and duration of squeezing are investigated.The two-mode atomic laser can be squeezed,but it is difficult to squeeze.The degree of squeezing is determined by initial light field.
The squeezing properties of optical field and atomic laser are studied in the system of two-mode SU (1, 1) coherent states interacting with two-level atomic BEC. The results show that two quadrature components of optical field can be squeezed periodically. The frequency of squeezing of optical field depends closely on both the interaction among atoms in BEC and the coupling constant between optical field and atoms. The maximum depth of squeezing is closely correlated to the two-mode SU (1, 1) coherent states parameters. The two quadrature components of atomic laser also can be squeezed, but it is difficult to squeeze. The maximum depth of squeezing is determined by the initial optical field.
The Hamiltonian operator of a system of V-type three-level atomic Bose-Einstein condensation interacting with two-mode squeezed coherent light field is analyzed in terms of the lattice-liquid model. It is indicated that the contribution of the interaction between atoms to the Hamiltonian in the literature is irrational,so the Hamiltonian operator is improved and the squeezing properties of atomic laser coupled output from the system of V-type three-level atomic Bose-Einstein condensation interacting with two-mode squeezed coherent light field are studied. The results show that the interaction intensity of light-atoms in the Bose-Eimtein condenation has evident influence on the fluctuations of two quadrature components of the atomic laser.
为和联合的紧张依赖者的不同形式的非线性的相互作用，从相关的二模式的苏(1,1 ) 的纠纷转移到开始可分离、混合的原子的协调状态(SCS ) 被调查。联合的合适的紧张依赖者能提高纠纷转移并且让原子纠纷特别为开始混合的原子状态周期性地演变，这被发现。为 SCS，在二个模式之间的纠纷随这些域的二个模式之间的光子数字差别(PND ) 的增加被加强。当 PND 是奇怪的时，在原子之间的纠纷是不到那当 PND 是平的时。