  Unlike the entanglement of quantum states, very little is known about the
entanglement of bipartite channels, called dynamical entanglement. Here we work
with the partial transpose of a superchannel, and use it to define computable
measures of dynamical entanglement, such as the negativity. We show that a
version of it, the max-logarithmic negativity, represents the exact asymptotic
dynamical entanglement cost. We discover a family of dynamical entanglement
measures that provide necessary and sufficient conditions for bipartite channel
simulation under local operations and classical communication and under
operations with positive partial transpose.
