Broadcasting of entanglement via local copying
Vladimír Bužek, Vlatko Vedral, Martin Bodo Plenio, P. L. Knight, Mark S. Hillery · Physical Review A · 1997
We show that inseparability of quantum states can be partially broadcasted (copied or cloned) with the help of local operations, i.e., distant parties sharing an entangled pair of spin-1/2 states can generate two pairs of partially nonlocally entangled states using only local operations. This procedure can be viewed as an inversion of quantum purification procedures.