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arXiv 1803.04522quant-phmath.PR
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量子行走的一些极限定律及其对Parrondo悖论的应用

Some limit laws for quantum walks with applications to a version of the Parrondo paradox

Takuya Machida, F. Alberto Grunbaum

摘要:

量子步行者在整数上移动,有四个额外的自由度,执行硬币移位操作,以离散的时间单位改变其内部状态和位置。时间演化用幺正过程描述。我们的重点是寻找极限概率定律的位置的步行者和研究它通过傅立叶分析。量子步行者表现出局部化和弹道行为。我们的两个结果给出了2周期时间依赖行走的极限定理,它们描述了步行者在重复了大量的酉过程后的位置。这些定理提供了一个分析工具来研究由J.Rajendran和C.本杰明通过非常好的数值模拟[1]。有了我们的分析工具,我们可以很容易地探索其中一个游戏的参数的“相空间”,类似于他们论文中的获胜游戏。我们包括数值证据表明,我们的两个游戏,类似于他们的,表现出Parrondo类型的悖论。

英文摘要:

A quantum walker moves on the integers with four extra degrees of freedom, performing a coin-shift operation to alter its internal state and position at discrete units of time. The time evolution is described by a unitary process. We focus on finding the limit probability law for the position of the walker and study it by means of Fourier analysis. The quantum walker exhibits both localization and a ballistic behavior. Our two results are given as limit theorems for a 2-period time-dependent walk and they describe the location of the walker after it has repeated the unitary process a large number of times. The theorems give an analytical tool to study some of the Parrondo type behavior in a quantum game which was studied by J. Rajendran and C. Benjamin by means of very nice numerical simulations [1]. With our analytical tools at hand we can easily explore the "phase space" of parameters of one of the games, similar to the winning game in their papers. We include numerical evidence that our two games, similar to theirs, exhibit a Parrondo type paradox.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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