We cast observable measure of quantum coherence as a resource to control the quantum
speed limit (QSL) for unitary evolutions. For non-unitary evolutions, QSL depends on that of
the state of the system and environment together. We show that the product of the time
bound and the coherence (asymmetry) or the quantum part of the uncertainty behaves in a
geometric way under partial elimination and classical mixing of states. These relations give
a new insight into the quantum speed limit. We also show that our bound is experimentally …