Institute of Physics, University of Silesia, 41-500 Chorzów, Poland.
Chaos. 2019 Jan;29(1):013105. doi: 10.1063/1.5063335.
We study occupation of certain regions of phase space of an asymmetric superconducting quantum interference device (SQUID) driven by thermal noise, subjected to an external ac current and threaded by a constant magnetic flux. Thermally activated transitions between the states which reflect three deterministic attractors are analyzed in the regime of the noise induced dynamical localization of the Josephson phase velocity, i.e., there is a temperature interval in which the conditional probability of the voltage to remain in one of the states is very close to one. Implications of this phenomenon on the dc voltage drop across the SQUID are discussed. We detect the emergence of the power law tails in a residence time probability distribution of the Josephson phase velocity and discuss the role of symmetry breaking in dynamical localization induced by thermal noise. This phenomenon illustrates how deterministic-like behavior may be extracted from randomness by stochasticity itself. It reveals another face of noise.
我们研究了在热噪声驱动下、外加交流电流和恒定磁通作用下的非对称超导量子干涉器件（SQUID）的相位空间的某些区域的占据情况。在约瑟夫森相位速度的噪声诱导动力学局域化的范围内，分析了反映三个确定性吸引子的状态之间的热激活跃迁，即存在一个温度区间，其中电压保持在一个状态的条件概率非常接近 1。我们讨论了这一现象对 SQUID 两端的直流电压降的影响。我们检测到约瑟夫森相位速度的停留时间概率分布中出现幂律尾部，并讨论了热噪声诱导的动力学局域化中对称性破缺的作用。这种现象说明了随机性本身如何从随机性中提取出类似确定性的行为。它揭示了噪声的另一面。
