arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2312.04492math-phmath.MPmath.SP
收藏

晶体晶格与环面上连续时间量子游走的遍历定理

Ergodic theorems for continuous-time quantum walks on crystal lattices and the torus

Anne Boutet de Monvel, Mostafa Sabri

AI总结:

本文研究连续时间量子游走的等分布与遍历性,证明平坦环面点质量初始态及晶体晶格离散情形的遍历定理,并刻画周期图上的扩散或局域化行为。

摘要:

我们给出了经典 Kronecker–Weyl 定理的若干量子动力学类比;该定理指出,环面上沿几乎每个方向的自由运动轨迹都趋于等分布。作为量子类比,我们研究从局域化初始状态 ψ 出发的量子游走 exp(-itΔ)ψ。若该演化状态随时间推移变得等分布,则该流就是遍历的。我们证明,在平坦环面上,只要从点质量出发,情况确实如此;同时我们还证明了晶体晶格上这一结果的离散类比。在某些周期图上,质量会非均匀地扩散,而在另一些图上则保持局域化。最后,我们给出了球面上不等分布的量子演化例子。

英文摘要:

We give several quantum dynamical analogs of the classical Kronecker-Weyl theorem, which says that the trajectory of free motion on the torus along almost every direction tends to equidistribute. As a quantum analog, we study the quantum walk $\exp(-i t Δ) ψ$ starting from a localized initial state $ψ$. Then the flow will be ergodic if this evolved state becomes equidistributed as time goes on. We prove that this is indeed the case for evolutions on the flat torus, provided we start from a point mass, and we prove discrete analogs of this result for crystal lattices. On some periodic graphs, the mass spreads out non-uniformly, on others it stays localized. Finally, we give examples of quantum evolutions on the sphere which do not equidistribute.

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。

↑