Normal and anti-normal ordered expressions for annihilation and creation operators

Abstract

We 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.

Cited by in corpus (1)

• Conservation of Quantum Correlations in Multimode Systems with $U(1)$ Symmetry