近日，意大利佛罗伦萨大学的Alessandro Coppo及其研究团队取得一项新进展。经过不懈努力，他们对用于谐振子的磁场时钟进行研究。相关研究成果已于2024年5月10日在国际知名学术期刊《物理评论A》上发表。
该研究团队根据Page和wooters的方法提出一种最近提出的定义时间方法，该方法基于对演化系统及其时钟作为非相互作用的纠缠系统的描述。研究人员研究了当与宏观相关的条件仅由时钟满足，或由时钟和演化系统同时满足时，量子动力学如何转变为类似经典的行为。
在对这种新出现的行为的描述中，经典的时间概念，以及相空间和轨迹的概念都占有一席之地。这使他们能够分析和讨论分别表征系统和时钟的量之间必须保持的关系，以便获取有关物理动力学的总体图像。
附：英文原文
Title: Magnetic clock for a harmonic oscillator
Author: Alessandro Coppo, Alessandro Cuccoli, Paola Verrucchi
Issue&Volume: 2024/05/10
Abstract: We present an implementation of a recently proposed procedure for defining time, based on the description of the evolving system and its clock as noninteracting, entangled systems, according to the Page and Wootters approach. We study how the quantum dynamics transforms into a classical-like behavior when conditions related to macroscopicity are met by the clock alone, or by both the clock and the evolving system. In the description of this emerging behavior finds its place the classical notion of time, as well as that of phase-space and trajectories on it. This allows us to analyze and discuss the relations that must hold between quantities that characterize the system and clock separately, in order for the resulting overall picture to be that of a physical dynamics as we mean it.
DOI: 10.1103/PhysRevA.109.052212
Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.052212
来源：科学网 小柯机器人