A spin-boson-like model with two interacting qubits is analysed. The model turns out to be
exactly solvable since it is characterized by the exchange symmetry between the two spins …

We study a generic time-dependent Jaynes–Cummings model, discovering universal
features of its time evolution on a dynamical time scale which is here defined as an integral …

In contrast to classical systems, actual implementation of non-Hermitian Hamiltonian
dynamics for quantum systems is a challenge because the processes of energy gain and …

Comprehensive study on parity-time (PT) symmetric systems demonstrates the novel
properties and innovative application of non-Hermitian physics in recent years. In the …

We consider spin‐chain‐star systems characterized by N‐wise many‐body interactions
between the spins in each chain and the central one. We show that such systems can be …

It has been theoretically demonstrated that two spins (qubits or qutrits), coupled by
exchange interaction only, undergo a coupling-based joint Landau-Majorana-Stückelberg …

A system of a quantum harmonic oscillator bi-linearly coupled with a Glauber amplifier is
analysed considering a time-dependent Hamiltonian model. The Hilbert space of this system …

We report the step-by-step construction of the exact, closed and explicit expression for the
evolution operator U (t) of a localized and isolated qubit in an arbitrary time-dependent field …

The occurrence of a second-order superradiant quantum phase transition is brought to light
in a quantum system consisting of two interacting qubits coupled to the same quantized field …

The class of two-interacting-qubit spin–boson models with vanishing transverse fields on the
spin-pair is studied. The model can be mapped exactly into two independent standard single …