标题： 三部分和两部分连续变量三部分系统的纠缠 显示英文标题

标题： Tripartite and bipartite entanglement in continuous-variable tripartite systems

摘要： 我们从三部分和两部分纠缠特性方面考察了一个不对称和两个完全对称的高斯连续变量系统。 我们处理纯态，并能够使用未耗尽泵近似来求解哈密顿量模型的解析解，以及使用标准分束器关系来求解混合光学参量振荡器输出的模型。 我们的两个对称系统表现出完美的三部分关联，但仅在无限压缩的非物理极限下才出现。 对于更现实的压缩参数，所有三个系统都表现出三部分和两部分纠缠。 我们得出结论，没有任何一个输出完全类似于GHZ或W态，但在某些参数区域中，它们会产生Adesso引入的T态\etal 。 不同相互作用参数下输出态的定性差异表明，连续变量三部分量子信息系统提供了双部分系统中不存在的灵活性。 显示英文摘要

摘要： We examine one asymmetric adnd two fully symmetric Gaussian continuous-variable systems in terms of their tripartite and bipartite entanglement properties. We treat pure states and are able to find analytic solutions using the undepleted pump approximation for the Hamiltonian models, and standard beamsplitter relations for a model that mixes the outputs of optical parametric oscillators. Our two symmetric systems exhibit perfect tripartite correlations, but only in the unphysical limit of infinite squeezing. For more realistic squeezing parameters, all three systems exhibit both tripartite and bipartite entanglement. We conclude that none of the outputs are completely analogous to either GHZ or W states, but there are parameter regions where they produce T states introduced by Adesso \etal The qualitative differences in the output states for different interaction parameters indicate that continuous-variable tripartite quantum information systems offer a versatility not found in bipartite systems.