Non-Hermitian systems, with symmetric or antisymmetric Hamiltonians under the parity-time (PT) operations, can have entirely real or imaginary eigenvalues. This fact has led to surprising discoveries such as loss-induced lasing and topological energy transfer. A merit of anti-PT systems is free of gain, but in recent efforts on making anti-PT devices, nonlinearity is still required. Here, counterintuitively, we show how to achieve anti-PT symmetry and its spontaneous breaking in a linear device by spinning a lossy resonator. Compared with a Hermitian spinning device, significantly enhanced optical isolation and ultrasensitive nanoparticle sensing are achievable in the anti-PT-broken phase. In a broader view, our work provides a new tool to study anti-PT physics, with such a wide range of applications as anti-PT lasers, anti-PT gyroscopes, and anti-PT topological photonics or optomechanics.

中文翻译：

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通过旋转谐振器破坏抗PT对称性。

在奇偶时间（PT）运算下具有对称或反对称哈密顿量的非埃尔米特系统，可以具有完全的实或虚特征值。这一事实导致了令人惊讶的发现，例如损耗引起的激光发射和拓扑能量转移。抗PT系统的优点是没有收益的，但是在制造抗PT装置的最新努力中，仍然需要非线性。在这里，与直觉相反，我们展示了如何通过旋转有损谐振器来实现线性器件中的反PT对称性及其自发性破坏。与Hermitian旋转设备相比，在反PT断裂阶段可实现显着增强的光学隔离和超灵敏的纳米粒子感测。从更广泛的角度来看，我们的工作提供了一种研究反PT物理的新工具，其应用范围广泛，例如反PT激光器，反PT陀螺仪，