近日，东北师范大学的王刚成及其研究小组与新加坡科技与设计大学的Chunfeng Wu合作并取得一项新进展。经过不懈努力，他们通过周期调制实现基态手性激发。相关研究成果已于2024年7月10日在国际知名学术期刊《物理评论A》上发表。

在这项研究中，研究人员设计了光子介导的Dzyaloshinskii-Moriya相互作用的组成部分，旨在模拟基于量子场与经典场共同驱动的，三能级原子系统中基态的手性激发过程。他们运用了绝热消去技术，成功推导出了在基态流形内两能级系统有效的Dzyaloshinskii-Moriya相互作用哈密顿量，这一哈密顿量能够确保通过周期性的调制手段实现预期的动力学行为。

进一步地，通过精心选择驱动的频率与相位，研究人员成功实现了三态乃至多态的手性激发。数值模拟的结果清晰地展示了该方法，在生成高质量三态手性激发以及稳定多态手性激发方面的有效性。

此外，她们还详细讨论了不利因素对手性电流的影响，潜在的实验可行性进一步表明，这项研究结果为量子态转移和未来的量子网络提供了可能性。

附：英文原文

Title: Ground-state chiral excitation via periodic modulation

Author: Shuyue Wang, Wuji Zhang, Chunfang Sun, Chunfeng Wu, Gangcheng Wang

Issue&Volume: 2024/07/10

Abstract: In this study we engineer the component of the Dzyaloshinskii-Moriya interaction mediated by photons to emulate ground-state chiral excitation based on three-level atoms driven by quantum and classical fields. We employ adiabatic elimination techniques to derive an effective Dzyaloshinskii-Moriya interaction Hamiltonian of two-level systems in the ground-state manifold, which can ensure the desired dynamics is achieved through the implementation of periodic modulation. Meanwhile, three-state and multistate chiral excitation can be obtained by choosing appropriate driving frequencies and phases. The numerical simulation results clearly indicate that our proposal can generate the comparatively perfect three-state chiral excitation and relatively reliable multistate chiral excitation. Moreover, the influence of unfavorable factors on the chiral current is discussed in detail, and the potential experimental feasibility further shows that our results provide possibilities for quantum state transfer and future quantum networks.

DOI: 10.1103/PhysRevA.110.012432

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.012432