Bosonic quantum devices offer a novel approach to realize quantum computations, where
the quantum two-level system (qubit) is replaced with the quantum (an) harmonic oscillator …

We review the effects of excited-state quantum phase transitions (ESQPTs) in interacting
many-body systems with finite numbers of collective degrees of freedom. We classify typical …

Recent developments and applications of high‐resolution Fourier transform spectroscopy
are reviewed. A short historical summary of the development of high‐resolution …

Out-of-time-order correlators (OTOCs) play an increasingly important role in different fields of
physics and in particular they provide a way of quantifying information scrambling in …

We study the structure of the eigenstates and the dynamics of a system that undergoes an
excited-state quantum phase transition (ESQPT). The analysis is performed for two-level …

Excited-state quantum phase transitions extend the notion of quantum phase transitions
beyond the ground state. They are characterized by closing energy gaps amid the spectrum …

Excited-state quantum phase transitions (ESQPTs) are generalizations of quantum phase
transitions to excited levels. They are associated with local divergences in the density of …

We analyze shape phase transitions in two-dimensional algebraic models. We apply our
analysis to linear-to-bent transitions in molecules and point out what observables are …

Signatures of quantum phase transitions (QPTs) and excited state quantum phase
transitions (ESQPTs) in the bending motion of eight XYZ triatomic molecules (HCN, HNC …

We investigate precursors of critical behavior in the quasienergy spectrum due to the
dynamical instability in the kicked top. Using a semiclassical approach, we analytically …