【摘要】 本文研究了压缩真空激发态的高阶压缩性质.发现θ等于零时这种态中正交分量的2N 阶矩表达式可以化为压缩真空态的2N 阶矩和一个与 m有关的函数相乘的形式.进一步分析表明当压缩参数 r 足够大时,这种态可以压缩至任意偶数阶;对于确定的 r 和 m,压缩至2N 阶的这种态必然会压缩至(2N+2)阶.更多还原

【Abstract】 The higher-order squeezing properties for the states generated by excitations on a squeezed vacuum state are studied.We find that,when θ=0,the expression of the 2N th moment of the quadrature for such states can be factorized as 2N th moment for the squeezed vacuum and a m- dependent function.The detailed analysis shows that when the squeezing parameter r is large enough, the states can be squeezed to any even order and that,for definite r and m,the states which squeezed to 2N-order are definitely squeezed to(2N+2)-order.更多还原