Let $A$ be matrix in $M_{n}$ (i.e., $n\times n$ complex matrices), and $\|A\|\le 1$, we call it a contraction.

Assume that $A$ and $B$ are contractions such that $I-AA^*$ and $I-BB^*$ are positive-definite.

How to show that $$\text{Tr}\left(1-AA^*\right)^{-1}\cdot \text{Tr}\left(1-BB^*\right)^{-1} \ge \left(\text{Tr}(1-AB^*)^{-1}\right)^2.$$

This problem is similar to the Cauchy-Schwarz inequality. (if you don't know the contraction matrix) and I found this paper give the contraction. http://ac.els-cdn.com/S0024379507003710/1-s2.0-S0024379507003710-main.pdf?_tid=b1696360-f73a-11e3-9613-00000aab0f01&acdnat=1403131900_0ced864818647681ff916fc376a0f461