Central Limit Theorem for tensor products of free variables

We establish a central limit theorem for tensor product random variables $c_k:=a_k\otimes a_k$, where $(a_k{)}_{k\in \mathbb{N}}$ is a free family of variables. We show that if the variables $a_k$ are centered, the limiting law is the semi-circle. Otherwise, the limiting law depends on the mean and variance of the variables $a_k$ and corresponds to a free interpolation between the semi-circle law and the classical convolution of two semi-circle laws.