Normal and anti-normal ordered expressions for annihilation and creation
operators [PDF]
J. M. Vargas-Martínez, H. Moya-CessaWe give the normal and anti-normal order expressions of the number operator to the power $k$ by using the commutation relation between the annihilation and creation operators. We use those expressions to give general formulae for functions of the number operator in normal and anti-normal order.View original: http://arxiv.org/abs/1304.0385
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