Exact invariant states of the generalized squeezing operator

Details Exact invariant states of the generalized squeezing operator Exact invariant states of the generalized squeezing operator

2008-05-23

arxiv.org/abs/0805.3666v2

Physics

Quantum Physics

Scientific paper

We explicitly construct the states that are invariant under the action of the generalized squeezing operator $\exp{(z{a^{\dagger}}^k-z^*a^k)}$ with integer $k \geq 3$. There are $k$ such states for a given value of $k$. We show that in the number representation the states behave as $n^{-k/4}$ for large $n$'s. This implies that for any $k\geq3$ the states are normalizable. However, for a given $k$ the expectation values of operators of the form $(a^{\dagger} a)^j$ diverge for the integer $j\geq (k/2-1)$. For $k=3$ we also give an explicit form of these states in the momentum representation in terms of Bessel functions.

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