Parity-Time (PT) symmetry is an emerging concept in quantum mechanics where non-Hermitian Hamiltonians can exhibit real eigenvalues. Now, PT symmetric optical microresonators have been demonstrated to break the bandwidth-efficiency limit for nonlinear optical signal processing.

中文翻译：

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奇偶校验-时间对称有助于突破新极限

宇称时间（PT）对称性是量子力学中的一个新兴概念，其中非厄米哈密顿量可以表现出真实的特征值。现在，PT 对称光学微谐振器已被证明可以突破非线性光学信号处理的带宽效率限制。