Cohen O, Brun T A
Physics Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Phys Rev Lett. 2000 Jun 19;84(25):5908-11. doi: 10.1103/PhysRevLett.84.5908.
Methods for distilling Greenberger-Horne-Zeilinger (GHZ) states from arbitrary entangled tripartite pure states are described. These techniques work for virtually any input state. Each technique has two stages which we call primary and secondary distillations. Primary distillation produces a GHZ state with some probability, so that when applied to an ensemble of systems a certain percentage is discarded. Secondary distillation produces further GHZs from the discarded systems. These protocols are developed with the help of an approach to quantum information theory based on absolutely selective information, which has other potential applications.
描述了从任意纠缠的三方纯态中蒸馏出格林伯格-霍恩-泽林格（GHZ）态的方法。这些技术几乎适用于任何输入态。每种技术都有两个阶段，我们称之为一次蒸馏和二次蒸馏。一次蒸馏以一定概率产生一个GHZ态，因此当应用于一组系统时，会丢弃一定比例的系统。二次蒸馏从丢弃的系统中产生更多的GHZ态。这些协议是借助基于绝对选择性信息的量子信息理论方法开发的，该方法还有其他潜在应用。
