  Let $x\geq 1$ be a large integer, and let
$\mu:\mathbb{N}\longrightarrow\{-1,0,1\}$ be the Mobius function. This article
proposes an effective asymptotic result for the autocorrelation function
$\sum_{n \leq x} \mu(n) \mu(n+t) =O\left( e^{-c\sqrt{\log x}}\right) $, where
$t\ne 0$ be a small fixed integer, and $c>0$ is a constant.
