Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria.
Phys Rev Lett. 2013 Jun 28;110(26):260503. doi: 10.1103/PhysRevLett.110.260503.
We investigate measurement-based entanglement purification protocols (EPP) in the presence of local noise and imperfections. We derive a universal, protocol-independent threshold for the required quality of the local resource states, where we show that local noise per particle of up to 24% is tolerable. This corresponds to an increase of the noise threshold by almost an order of magnitude, based on the joint measurement-based implementation of sequential rounds of few-particle EPP. We generalize our results to multipartite EPP, where we encounter similarly high error thresholds.
我们研究了存在局部噪声和不完美情况下基于测量的纠缠纯化协议（EPP）。我们推导出了一个通用的、与协议无关的局部资源状态质量所需的阈值，结果表明每个粒子的局部噪声高达 24%是可以容忍的。这相当于在基于联合测量的少数粒子 EPP 的连续轮次的序贯实现基础上，噪声阈值增加了近一个数量级。我们将我们的结果推广到多粒子 EPP，在这种情况下，我们也遇到了类似的高误差阈值。
