We study the dynamics of quantum correlations for two non interacting qubits initially prepared in a maximally entangled state and then coupled with an external environment characterized by a noise spectrum of the form 1/fα. The noise spectrum is due to the interaction of each qubit with a collection of Nf classical fluctuators with fixed switching rates. We find that, depending on the characteristic of the noise spectrum considered, both entanglement and quantum discord display either a monotonic decay or the phenomena of sudden death and revivals.
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机译：我们研究了两个非相互作用的量子位的量子相关动力学，这些量子态最初是在最大纠缠状态下制备的，然后与一个以1 / f α形式的噪声谱为特征的外部环境耦合。噪声频谱是由于每个量子位与具有固定转换速率的N f 个经典涨落的集合之间的相互作用而引起的。我们发现，根据所考虑的噪声频谱的特性，纠缠和量子不和谐都显示单调衰减或突然死亡和复兴的现象。
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