  We define the quantum Wasserstein distance such that the optimization of the
coupling is carried out over bipartite separable states rather than bipartite
quantum states in general, and examine its properties. Surprisingly, we find
that the self-distance is related to the quantum Fisher information. We present
a transport map corresponding to an optimal bipartite separable state. We
discuss how the quantum Wasserstein distance introduced is connected to
criteria detecting quantum entanglement. We define variance-like quantities
that can be obtained from the quantum Wasserstein distance by replacing the
minimization over quantum states by a maximization. We extend our results to a
family of generalized quantum Fisher information quantities.
