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 …

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 …

Transmon qubits are the predominant element in circuit-based quantum information
processing, such as existing quantum computers, due to their controllability and ease of …

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 …

We propose that a broad class of excited-state quantum phase transitions (ESQPTs) gives
rise to two different excited-state quantum phases. These phases are identified by means of …

Dynamical phase transitions are defined through nonanalyticities of the survival probability
of an out-of-equilibrium time-evolving state at certain critical times. They ensue from zeros of …

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 …

Abstract Quantum Phase Transitions arising in algebraic and collective models of nuclear
structure are reviewed. The concept of quantum phases and phase transitions is described …

This article extends our previous analysis Stránský et al.(2014) of Excited-State Quantum
Phase Transitions (ESQPTs) in systems of dimension two. We focus on the oscillatory …