Conformally flat quasi contact metric manifolds

In this paper quasi contact metric manifolds, which are conformally flat are studied. We prove that a conformally flat quasi contact metric manifold \(M^{2n+1}\) $M^{2n+1}$ with \(n\ge 3\) $n\ge 3$ whose characteristic vector field is Killing, has constant curvature \(+1\) $+1$ and thus is Sasakian. Also we consider conformally flat quasi contact metric manifolds on which the Ricci operator Q commutes with \(\phi \) $\varphi$ .