Research Institute for Solid State Physics and Optics, H-1525 Budapest Post Office Box 49, Hungary.
Phys Rev Lett. 2011 Sep 2;107(10):100501. doi: 10.1103/PhysRevLett.107.100501. Epub 2011 Aug 31.
The dynamics of an ensemble of identically prepared two-qubit systems is investigated which is subjected to the iteratively applied measurements and conditional selection of a typical entanglement purification protocol. The resulting dynamics exhibits strong sensitivity to initial conditions. For one class of initial states two types of islands characterize the asymptotic limit. They correspond to a separable and a fully entangled two-qubit state, respectively, and their boundaries form fractal-like structures. In the presence of incoherent noise an additional stable asymptotic cycle appears.
研究了一组相同制备的两量子比特系统的动力学，该系统经历了典型的纠缠纯化协议的迭代应用测量和条件选择。所得到的动力学对初始条件表现出很强的敏感性。对于一类初始状态，两个类型的岛屿特征化了渐近极限。它们分别对应于可分离的和完全纠缠的两量子比特态，并且它们的边界形成分形样结构。在存在非相干噪声的情况下，出现了一个额外的稳定渐近循环。
