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利用共振的Jaynes-Cummings(缩写为J-C)模型研究腔内相干光场与原子多次作用后所产生挤压效应。在单光子跃迁情况,对适当选取的小的作用时间,通过多次作用可以提高压缩度,但有限制,次数太多,压缩反而变坏。在双光子跃迁情况,对于强相干光和适当取值的作用时间t=π/g2,可以求出被压缩的不确定度与作用次数间的解析关系式。此式表明,选取适当的作用次数可以得到深度压缩。初始平均光子数N愈大,能达到的最大压缩愈强。Two level atoms are injected into ideal cavity one by one to interact with the light field therein which intially is in coherent state. In one-photon transition case, the quadrature variance could be reduced by this means for suitably chosen interaction time t. But there exists some limitation, the squeezing will become worse if the number of times K is too large. In twophoton transition case, for large mean photon tumber N and optimum interaction time t = π/ g2, analytical formula for dependence of quadrature variance on N and K can be obtained. This formula shows that deep squeezing can be achieved by suitably chosen K. And the larger the N is, the stronger the achievable squeezing will be.
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