论文标题
两个间接耦合能水平之间的非转向性转变
Nonreciprocal transition between two indirectly coupled energy levels
论文作者
论文摘要
我们提出了一种理论方案，以实现无法直接耦合的两个能级之间的非偏置过渡。假设它们通过两个辅助水平间接耦合，并具有环状四级配置，并且循环配置中的四个过渡由外部场控制。当合成磁通量（即通过环状四级配置）破坏了系统的时间反转对称性时，间接过渡变为非转换。可以通过消除自发发射光谱中的光谱线来鉴定非偏腹转变。我们的工作引入了一种可行的方法，可以在广泛的多层次系统中观察到非偏置过渡，包括天然原子或具有平等对称性的离子。
We propose a theoretical scheme to realize nonreciprocal transition between two energy levels that can not coupled directly. Suppose they are coupled indirectly by two auxiliary levels with a cyclic four-level configuration, and the four transitions in the cyclic configuration are controlled by external fields. The indirectly transition become nonreciprocal when the time reversal symmetry of the system is broken by the synthetic magnetic flux, i.e., the total phase of the external driving fields through the cyclic four-level configuration. The nonreciprocal transition can be identified by the elimination of a spectral line in the spontaneous emission spectrum. Our work introduces a feasible way to observe nonreciprocal transition in a wide range of multi-level systems, including natural atoms or ions with parity symmetry.
