Vidal G, Dür W, Cirac J I
Institute for Quantum Information, California Institute of Technology, Pasadena, California 91125, USA.
Phys Rev Lett. 2002 Jul 8;89(2):027901. doi: 10.1103/PhysRevLett.89.027901. Epub 2002 Jun 20.
We compute the entanglement cost of several families of bipartite mixed states, including arbitrary mixtures of two Bell states. This is achieved by developing a technique that allows us to ascertain the additivity of the entanglement of formation for any state supported on specific subspaces. As a side result, the proof of the irreversibility in asymptotic local manipulations of entanglement is extended to two-qubit systems.
我们计算了几类二分混合态的纠缠代价，包括两个贝尔态的任意混合态。这是通过开发一种技术来实现的，该技术使我们能够确定在特定子空间上支持的任何态的形成纠缠的可加性。作为一个附带结果，纠缠渐近局部操作中不可逆性的证明被扩展到两比特系统。
