Rates of asymptotic entanglement transformations for bipartite mixed states: Maximally entangled states are not special
Michał Horodecki, Aditi Sen, Ujjwal Sen · Physical Review A · 2003
We investigate the asymptotic rates of entanglement transformations for bipartite mixed states by local operations and classical communication (LOCC). We analyze the relations between the rates for different transitions and obtain simple lower and upper bounds for these transitions. In a transition from one mixed state to another and back, the amount of irreversibility can be different for different target states. Thus in a natural way, we get the concept of ``amount'' of irreversibility in asymptotic manipulations of entanglement. We investigate the behavior of these transformation rates for different target states. We show that with respect to asymptotic transition rates under LOCC, the maximally entangled states do not have a special status. In the process, we obtain that the entanglement of formation is additive for all maximally correlated states. This allows us to show irreversibility in asymptotic entanglement manipulations for maximally correlated states in $2\ensuremath{\bigotimes}2.$ We also show that the possible nonequality of distillable entanglement under LOCC and that under operations preserving the positivity of partial transposition is related to the behavior of the transitions (under LOCC) to separable target states.