标题： 来自各向同性态的纠缠远程制备界限 显示英文标题

标题： Bound on remote preparation of entanglement from isotropic states

摘要： 以 negativity 作为纠缠度量，我们研究了远程准备纠缠的可能量。对于两组四维量子系统 12 和 34 上的两个相同的各向同性态，我们计算了通过在系统 24 上联合测量而远程分布到系统 13 的纠缠平均量，并证明了在高维量子系统中，如果各向同性态与最大纠缠态具有一定的保真度，或者如果各向同性态的保真度大于某个依赖于维度的值时，由广义 Bell 测量实现的纠缠远程制备在秩一测量中是最优的。此外，当各向同性态具有较小保真度时，我们构造了一种优于广义 Bell 测量的测量方法，用于纠缠的远程制备。 显示英文摘要

摘要： Using the negativity as an entanglement measure, we investigate the possible amount of remotely prepared entanglement. For two identical isotropic states on two-qudit systems 12 and 34, we calculate the average amount of entanglement remotely distributed on the system 13 by joint measurement on the system 24, and show that the remote preparation of entanglement by the generalized Bell-measurement is optimal among rank-one measurements if the isotropic states have a certain fidelity with a maximally entangled state in higher dimensional quantum systems, or if the fidelity of the isotropic states is greater than a certain value depending on the dimension. In addition, we construct a measurement better than the generalized Bell-measurement with respect to the remote preparation of entanglement when the isotropic states have small fidelity.