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\\left(t\\right) \\mathbf{\\colon}\\left(\\xi a^{\\dagger}a\\right) ^{n}e^{-\\xi a^{\\dagger}a}/n!\\colon \\right\\} ,${\\small \\ becomes}$p\\left(n,t\\right) =Tr% \\left[ \\rho \\left(0\\right) \\mathbf{\\colon}\\left(\\xi e^{-2\\kappa t}a^{\\dagger}a\\right) ^{n}e^{-\\xi e^{-2\\kappa t}a^{\\dagger}a}/n!\\colon % \\right] ,${\\small \\ as if the quantum 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