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arXiv 2104.10091quant-ph
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图上随机游动的广义量子-经典对应

Generalized quantum-classical correspondence for random walks on graphs

Massimo Frigerio, Claudia Benedetti, Stefano Olivares, Matteo G. A. Paris

摘要:

我们引入了一个最小的物理动机的假设,连续时间量子行走的哈密顿H应该满足,以适当地表示在给定的图上的经典随机行走的量子对应。我们发现,这些条件是由无限多个量子哈密顿满足,这为量子增强协议提供了新的自由度,特别是,现场能量,即H的对角元素,和非对角元素的相位在量子侧不受约束。对角元素表示量子行走的势能景观,并且可以通过与经典标量场的相互作用来控制,而对于一般维度的规则晶格,H的非对角相位可以通过与驻留在边缘上的经典规范场的相互作用来调谐,例如,带电步行者的电磁矢量势

英文摘要:

We introduce a minimal set of physically motivated postulates that the Hamiltonian H of a continuous-time quantum walk should satisfy in order to properly represent the quantum counterpart of the classical random walk on a given graph. We found that these conditions are satisfied by infinitely many quantum Hamiltonians, which provide novel degrees of freedom for quantum enhanced protocols, In particular, the on-site energies, i.e. the diagonal elements of H, and the phases of the off-diagonal elements are unconstrained on the quantum side. The diagonal elements represent a potential energy landscape for the quantum walk, and may be controlled by the interaction with a classical scalar field, whereas, for regular lattices in generic dimension, the off-diagonal phases of H may be tuned by the interaction with a classical gauge field residing on the edges, e.g., the electro-magnetic vector potential for a charged walker.

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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