It is generally assumed that a Hamiltonian for a physically acceptable quantum system (one
that has a positive-definite spectrum and obeys the requirement of unitarity) must be …

A quantum thermal machine is an open quantum system coupled to hot and cold thermal
baths. Thus, its dynamics can be well understood using the concepts and tools from non …

Exceptional points (EPs) in non-Hermitian systems have recently attracted wide interest and
spawned intriguing prospects for enhanced sensing. However, EPs have not yet been …

Quantum heat engines are expected to outperform the classical counterparts due to
quantum coherences involved. Here we experimentally execute a single-ion quantum heat …

Non-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus
of much attention due to their singular eigenvalue surface structure. Nevertheless, as …

Superconducting quantum circuits are a natural platform for quantum simulations of a wide
variety of important lattice models describing topological phenomena, spanning condensed …

Open quantum systems interacting with an environment exhibit dynamics described by the
combination of dissipation and coherent Hamiltonian evolution. Taken together, these …

Imposing topological operations encircling an exceptional point (EP) engenders
unconventional one-way topological phonon transfer (TPT), strictly depending on the …

Exceptional points (EPs) are singularities in non-Hermitian systems, where k (k≥ 2)
eigenvalues and eigenstates coalesce. High-order EPs exhibit richer topological …

Exceptional points (EPs) are non‐Hermitian degeneracies or branch points where
eigenvalues and their corresponding eigenvectors coalesce. Due to the complex non‐trivial …