Superactivation of bound entanglement.
We show that, in a multiparty setting, two nondistillable (bound-entangled) states tensored together can make a distillable state. This is an example of true superadditivity of distillable entanglement. We also show that unlockable bound-entangled states cannot be asymptotically unentangled, providing the first proof that some states are truly bound-entangled in the sense of being both nondistillable and nonseparable asymptotically.
Shor
Peter W
PW
AT&T Labs-Research, Florham Park, New Jersey 07932, USA.
Smolin
John A
JA
Thapliyal
Ashish V
AV