【摘要】 本文推演出密度矩阵元拓扑图示的最简约化方法.应用这方法,仅用n+1个拓扑图即可完备表征n阶非线性极化率, 与此同时还给出表达式中每一项的微观通道数.更多还原

【Abstract】 The method to merge the diagrammatic representation of density matrix to the simplest form is deduced. In this way it is quite enough that the nth-susceptibility could be expressed only by n + 1 diagrams, and microchannel number in every term ofsuseeptibility could be obtained simultaneously.更多还原