to assess the extent of entanglement directly from tomograms, circumventing detailed state reconstruction.

In earlier work  [@sharmila] we have proposed a tomographic entanglement indicator $\xi_{\textsc{tei}}$ based on mutual information, that is obtained directly from the relevant tomograms. We have tested its efficacy in bipartite CV systems evolving unitarily under nonlinear Hamiltonians, by comparing it both with $\xi_{\textsc{svne}}$ and with an entanglement indicator $\xi_{\textsc{ipr}}$ based on inverse participation ratios [@sharmila2]. (The participation ratio is a measure of delocalization in a given basis.) It has been shown that $\xi_{\textsc{tei}}$ and $\xi_{\textsc{ipr}}$ capture the gross features of entanglement dynamics. A time-series analysis of the difference $|\xi_{\textsc{tei}}-\xi_{\textsc{svne}}|$ was used to quantify the deviation of $\xi_{\textsc{tei}}$ from $ \xi_{\textsc{svne}}$ as a function of time. Although this is sensitive to the specific choice of initial state and the strength of the nonlinearity in the Hamiltonian, it has been shown that $\xi_{\textsc{tei}}$ is a reasonably good indicator of entanglement in general. In multipartite hybrid quantum (HQ) systems comprising two-level atoms interacting with radiation fields, too, $\xi_{\textsc{tei}}$ turns out [@sharmila3] to be a good estimator of quantum correlations in both the field and the atomic subsystems. (In the atom sector, $\xi_{\textsc{tei}}$ is extracted directly from the corresponding qubit 