Vollbrecht Karl Gerd H, Wolf Michael M
Institute for Mathematical Physics, TU Braunschweig, Germany.
Phys Rev Lett. 2002 Jun 17;88(24):247901. doi: 10.1103/PhysRevLett.88.247901. Epub 2002 May 31.
We show that bipartite quantum states of any dimension, which do not have a positive partial transpose (NPPT), become 1-distillable when one adds an infinitesimal amount of bound entanglement. To this end we investigate the activation properties of a new class of symmetric bound entangled states of full rank. It is shown that in this set there exist universal activator states capable of activating the distillation of any NPPT state. The result shows that even a small amount of bound entanglement can be useful for quantum information purposes.
我们证明，任何维度的、不具有正部分转置（NPPT）的二分量子态，在添加无穷小量的束缚纠缠时会变得可1-蒸馏。为此，我们研究了一类新的满秩对称束缚纠缠态的激活特性。结果表明，在这个集合中存在能够激活任何NPPT态蒸馏的通用激活态。该结果表明，即使是少量的束缚纠缠也可用于量子信息目的。
