论文标题
纠缠在三分之一系统中的援助
Entanglement of assistance in three-qubit systems
论文作者
论文摘要
援助的纠缠量量化了可以使用某些辅助系统的帮助将可以集中在一组空间分离的当事方中的纠缠量。在本文中，我们研究了三个量子位最简单的情况下的援助纠缠。我们考虑当助手政党被当地的测量和古典交流毫无疑问时，我们会丢失多少纠缠。对于三量纯状态，发现当纠缠被局部生成钟状状态的最大概率量化时，始终可以实现无损脱钩。但是，关于大多数其他纠缠措施，例如同意和纠缠熵，只有我们完全表征的特殊国家，才有可能对助手的无损脱钩。
The entanglement of assistance quantifies the amount of entanglement that can be concentrated among a group of spatially-separated parties using the assistance of some auxiliary system. In this paper we study the entanglement of assistance in the simplest scenario of three qubits. We consider how much entanglement is lost when the helper party becomes uncoupled by local measurement and classical communication. For three-qubit pure states, it is found that lossless decoupling is always possible when entanglement is quantified by the maximum probability of locally generating a Bell state. However, with respect to most other entanglement measures, such as concurrence and entanglement entropy, a lossless decoupling of the helper is possible only for a special family of states that we fully characterize.
