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Open quantum random walks: ergodicity, hitting times, gambler's ruin and potential theory

机译:开放量子随机游走:遍历性,击中次数,赌徒的毁灭和   潜在理论

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摘要

In this work we study certain aspects of Open Quantum Random Walks (OQRWs), aclass of quantum channels described by S. Attal et al. \cite{attal}. As a firstobjective we consider processes which are nonhomogeneous in time, i.e., at eachtime step, a possibly distinct evolution kernel. Inspired by a spectraltechnique described by L. Saloff-Coste and J. Z\'u\~niga \cite{saloff}, wedefine a notion of ergodicity for finite nonhomogeneous quantum Markov chainsand describe a criterion for ergodicity of such objects in terms of singularvalues. As a second objective, and based on a quantum trajectory approach, westudy a notion of hitting time for OQRWs and we see that many constructions arevariations of well-known classical probability results, with the density matrixdegree of freedom on each site giving rise to systems which are seen to benonclassical. In this way we are able to examine open quantum versions of thegambler's ruin, birth-and-death chain and a basic theorem on potential theory.
机译:在这项工作中,我们研究开放量子随机游走(OQRWs)的某些方面,这是S. Attal等人描述的一类量子通道。 \ cite {attal}。作为第一个目标,我们考虑时间上不均匀的过程,即在每个时间步上可能是不同的演化内核。受L. Saloff-Coste和J.Z'u \ niga \ cite {saloff}描述的光谱技术的启发,我们定义了有限非均匀量子马尔可夫链的遍历性概念,并根据奇异值描述了此类物体的遍历性准则。作为第二个目标,并且基于量子轨迹方法,对OQRW的命中时间进行了构想,我们看到许多构造都是众所周知的经典概率结果的变体,每个站点上的密度矩阵自由度产生了这样的系统:被认为是非古典的。通过这种方式,我们能够检查赌徒废墟,生死链以及潜在理论的基本定理的开放量子形式。

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