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arXiv 1906.04483quant-phcs.DMhep-lat
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具有连续时间和连续时空极限的量子行走

A quantum walk with both a continuous-time and a continuous-spacetime limit

Giuseppe Di Molfetta, Pablo Arrighi

摘要:

目前,量子模拟方案有两种类型。它们要么是连续时间离散空间模型(也称为基于哈密顿的模型),属于非相对论性量子力学。或者它们是离散时空模型(也称为量子行走或基于量子元胞自动机),享受相对论连续时空限制。我们提供了一个量子模拟计划,统一这两种方法的第一个例子。所提出的方案支持一个连续时间离散空间的限制,导致晶格费米子,和一个连续时空的限制,导致狄拉克方程。两者之间的转变可以被认为是广义相对论的坐标变化,被推到了极端。作为这一过程的一个紧急的副产品,我们得到了一个在弯曲的时空与同步坐标格费米子的哈密顿量。

英文摘要:

Nowadays, quantum simulation schemes come in two flavours. Either they are continuous-time discrete-space models (a.k.a Hamiltonian-based), pertaining to non-relativistic quantum mechanics. Or they are discrete-spacetime models (a.k.a Quantum Walks or Quantum Cellular Automata-based) enjoying a relativistic continuous spacetime limit. We provide a first example of a quantum simulation scheme that unifies both approaches. The proposed scheme supports both a continuous-time discrete-space limit, leading to lattice fermions, and a continuous-spacetime limit, leading to the Dirac equation. The transition between the two can be thought of as a general relativistic change of coordinates, pushed to an extreme. As an emergent by-product of this procedure, we obtain a Hamiltonian for lattice-fermions in curved spacetime with synchronous coordinates.

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