Distillation of GHZ State from Multiple Copies of Arbitrary W-Class State

• 来源期刊: 理论物理通讯(英文版)
• 年，卷（期）: 2008,（6）
• 页码范围: 1502-1504
• 页数: 3页
• 语种: 英文

摘要

W. Dür et al. have shown that it is impossible to obtain a GHZ state from one copy of arbitrary W-class (2000) 062314]. In our paper, the more general case is carefully investigated. We first show that, with a supply of two copies of arbitrary W-class state, we can always construct an explicit procedure to distill a GHZ state with a nonzero probability. Then based on this result, a simple procedure for distilling GHZ state from n copies of arbitrary W-class state is presented. Finaily, we briefly discuss the applications.