Recently, there has been intense research in proposing and develo** various methods for
constructing high-order exceptional points (EPs) in dissipative systems. These EPs can …

Hamiltonian exceptional points (HEPs) are spectral degeneracies of non-Hermitian
Hamiltonians describing classical and semiclassical open systems with gain and/or loss …

Hamiltonian exceptional points (HEPs) are spectral degeneracies of non-Hermitian
Hamiltonians describing classical and semiclassical open systems with losses and/or gain …

We investigate two key aspects of quantum systems by using the Tavis-Cummings dimer
system as a platform. The first aspect involves unraveling the relationship between the …

In the traditional quantum theory, one-dimensional quantum spin models possess a
factorization surface where the ground states are fully separable and have vanishing …

We present a systematic investigation of the short-range spectral fluctuation properties of
three non-Hermitian spin-chain Hamiltonians using complex spacing ratios (CSRs) …

Phase transitions in non-Hermitian systems are at the focus of cutting edge theoretical and
experimental research. On the one hand, parity-time-(PT−) and anti− PT− symmetric physics …

The cxceptional point (EP) denotes the non-Hermitian degeneracy, in which both
eigenvalues and eigenstates become identical. By the conventional local Markovian master …

We analyse two quantum systems with hidden parity-time (PT) symmetry: one is an optical
device, whereas another is a superconducting microwave-frequency device. To investigate …

We discuss how introducing an equilibrium frame, in which a given Hamiltonian has
balanced loss and gain terms, can reveal PT symmetry hidden in non-Hermitian …