科研之友
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摘要
We find that the exponential operator V = exp[i.lambda(Q(1)P(2) Q(2)P(3) ... Q(n-1)P(n) Q(n)P(1))], Q(i), P-i are, respectively, the coordinate and momentum operators, is an n-mode squeezing operator which engenders standard squeezing. By virtue of the technique of integration within an ordered product of operators we derive V's normally ordered expansion and obtain the n-mode squeezed vacuum states, its Wigner function is calculated by using the Weyl ordering invariance under similar transformations.
