  Quantum state teleportation is a protocol where a shared entangled state is
used as a quantum channel to transmit quantum information between distinct
locations. Here we consider the task of estimating entanglement in
teleportation experiments. We show that the data accessible in a teleportation
experiment allows to put a lower bound on some entanglement measures, such as
entanglement negativity and robustness. Furthermore, we show cases in which the
lower bounds are tight. The introduced lower bounds can also be interpreted as
quantifiers of the nonclassicality of a teleportation experiment. Thus, our
findings provide a quantitative relation between teleportation and
entanglement.
