Irreversibility in Asymptotic Manipulations of Entanglement
Guifré Vidal, J. I. Cirac · Physical Review Letters · 2001
We show that the process of entanglement distillation is irreversible by showing that the entanglement cost of a bound entangled state is finite. Such irreversibility remains even if extra pure entanglement is loaned to assist the distillation process.