论文标题

观察手性状态转移而不包围特殊点

Observation of Chiral State Transfer Without Encircling an Exceptional Point

论文作者

Nasari, Hadiseh, Lopez-Galmiche, Gisela, Lopez-Aviles, Helena E., Schumer, Alexander, Hassan, Absar U., Zhong, Qi, Rotter, Stefan, LiKamWa, Patrick, Christodoulides, Demetrios N., Khajavikhan, Mercedeh

论文摘要

绝热定理是Schrödinger方程的推论,在非热安排中以极大的不同方式表现出自身,从而导致了封闭量子系统中没有对应物的反直觉转移方案。特别是,参数空间中特殊点(EP)的动态包围已显示导致手性相的积累,非绝热跳跃和拓扑模式转换[1-8]。然而,最近的理论研究表明,与先前确定的示威相反,这种行为并不是严格的结果,这是由于非弱者退化的结果[9]。取而代之的是,它似乎主要归因于Riemann表面的非平凡景观,有时是由于附近存在特殊点[9-11]。为了将非热系统的这一违反直觉的方面带入光线并确认这一假设,我们在这里提供了第一组实验,以直接在ep排除周期中直接观察到在缓慢变化的非Hermitian系统中的ep-ep-clectection循环中。为此,实现了一种多功能但独特的基于纤维的光子模拟器,该模拟器在准官方路径单环上利用了极化自由度。我们的观察结果可能为轻度操纵和国家转换开辟了新的途径,同时为理解非炎性系统中绝热定理的复杂性提供了基础。

The adiabatic theorem, a corollary of the Schrödinger equation, manifests itself in a profoundly different way in non-Hermitian arrangements, resulting in counterintuitive state transfer schemes that have no counterpart in closed quantum systems. In particular, the dynamical encirclement of exceptional points (EPs) in parameter space has been shown to lead to a chiral phase accumulation, non-adiabatic jumps, and topological mode conversion [1- 8]. Recent theoretical studies, however, have shown that contrary to previously established demonstrations, this behavior is not strictly a result of winding around a non-Hermitian degeneracy [9]. Instead, it appears to be mostly attributed to the non-trivial landscape of the Riemann surfaces, sometimes because of the presence of an exceptional point in the vicinity [9- 11]. In an effort to bring this counterintuitive aspect of non-Hermitian systems into light and confirm this hypothesis, we provide here the first set of experiments to directly observe the field evolution and chiral state conversion in an EP-excluding cycle in a slowly varying non- Hermitian system. To do so, a versatile yet unique fiber-based photonic emulator is realized that utilizes the polarization degrees of freedom in a quasi-common path single-ring arrangement. Our observations may open up new avenues for light manipulation and state conversion, while providing a foundation for understanding the intricacies of the adiabatic theorem in non-Hermitian systems.

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