For any Ritt operator $T$ acting on a noncommutative $L^p$-space, we define the notion of \textit{ completely} bounded functional calculus $H^\infty(B_\gamma)$ where $B_\gamma$ is a Stolz domain. Moreover, we introduce the `column square functions' $\norm{ x}_{ T,c,\alpha}=\Bnorm{ \Big(\sum_{ k=1}^{ +\infty}k^{ 2\alpha-1}|T^{ k-1}(I-T)^{ \alpha}(x)|^2\Big)^{ 1/2}}_{ L^p(M)}$ and the `row square functions' $\norm{ x}_{ T,r,\alpha}=\Bnorm{ \Big(\sum_{ k=1}^{ +\infty}k^{ 2\alpha-1} |\Big(T^{ k-1}(I-T)^{ \alpha}(x)\Big)^*|^2\Big)^{ 1/2}}_{ L^p(M)}$ for any $\alpha>0$ and any $x\in L^p(M)$. Then, we provide an example of Ritt operator which admits a completely bounded $H^\infty(B_\gamma)$ functional calculus for some $\gamma \in \big]0,\frac{ \pi}{ 2}\big[$ such that the square functions $\norm{ \cdot}_{ T,c,\alpha}$ and $\norm{ \cdot}_{ T,r,\alpha}$ are not equivalent. Moreover, assuming $1<p<2$ and $\alpha>0$, we prove that if $\Ran (I-T)$ is dense and $T$ admits a completely bounded $H^\infty(B_\gamma)$ functional calculus for some $\gamma \in \big]0,\frac{ \pi}{ 2}\big[$ then there exists a positive constant $C$ such that for any $x \in L^p(M)$, there exists $x_1, x_2 \in L^p(M)$ satisfying $x=x_1+x_2$ and $\norm{ x_1}_{ T,c,\alpha}+\norm{ x_2}_{ T,r,\alpha}\leq C \norm{ x}_{ L^p(M)}$. Finally, we observe that this result applies to a suitable class of selfadjoint Markov maps on noncommutative $L^p$-spaces.
Categories: math.OA math.FA