利用纠缠见证表征可蒸馏态和可激活态
Characterization of Distillable and Activable States using Entanglement Witnesses
摘要：
我们介绍了一种形式主义，连接纠缠证人和蒸馏和激活属性的状态。我们将这种形式主义应用于两种情况：首先，我们重新推导Eggeling等人在quant-ph/0104095中提出的结果，即，具有非正部分转置（NPPT）的任何二分状态的副本是可验证的或可激活的。其次，我们证明了存在三分NPPT状态，具有两个副本既不能被蒸馏，也不能被激活的属性。
英文摘要：
We introduce a formalism that connections entanglement witnesses and the distillation and activation properties of a state. We apply this formalism to two cases: First, we rederive the results presented in quant-ph/0104095 by Eggeling et al., namely that on copy of any bipartite state with non--positive partial transpose (NPPT) is either distillable, or activable. Second, we show that there exist three--partite NPPT states, with the property that two copies can neither be distilled, nor activated.
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