Exceptional points are degeneracies in physical systems at which both the underlying
eigenvalues and eigenvectors of the system coalesce. They originated in theoretical …

Parity–time (PT) symmetry challenges the long-held theoretical basis that only Hermitian
operators correspond to observable phenomena in quantum mechanics. Non-Hermitian …

Standard exceptional points (EPs) are non-Hermitian degeneracies that occur in open
systems. At an EP, the Taylor series expansion becomes singular and fails to converge—a …

With the rapid progress of high-quality superconducting and photonic resonators, it has
become possible to sense with extremely high precision a wide range of physical properties …

As a basic building block, optical resonant cavities (ORCs) are widely used in light
manipulation. They can confine electromagnetic waves and improve the interaction between …

A fundamental challenge for the nonradiative wireless power transfer (WPT) resides in
maintaining the stable power transmission with a consistently high efficiency under dynamic …

In recent years, peculiar physical phenomena enabled by non-Hermitian systems, especially
the parity-time (PT)-symmetric systems, have drawn tremendous research interests …

In this article, a new coupled structure based on microwave planar resonators is proposed to
demonstrate the capability of ultrahigh quality factor performance using a chipless passive …

We propose and experimentally demonstrate a parity-time-symmetric electronic system
exhibiting the self-dual emitter-absorber property with a remarkable modulation depth in the …

Optical monitoring of the position and alignment of objects with a precision of only a few
nanometres is key in applications such as smart manufacturing and force sensing …