One of the best signatures of nonclassicality in a quantum system is the existence of
correlations that have no classical counterpart. Different methods for quantifying the …

We review concepts and methods associated with quantum discord and related topics. We
also describe their possible connections with other aspects of quantum information and …

The transverse field Ising and XY models (the simplest quantum spin models) provide the
organising principle for the rich variety of interconnected subjects which are covered in this …

Understanding exotic forms of magnetism in quantum spin systems is an emergent topic of
modern condensed matter physics. Quantum dynamics can be described by particle-like …

We study the time evolution of classical and quantum correlations for hybrid qubit–qutrit
systems in independent and common dephasing environments. Our discussion involves a …

The distribution of bipartite entanglement in a mixed spin-(1/2, 1) Heisenberg tetramer
composed from two spin-1/2 and two spin-1 entities is investigated in detail in presence of …

We rigorously analyze the full tripartite entanglement of a mixed spin-(1/2, 1) Heisenberg
tetramer in the presence of an external magnetic field. The tetramer consists of two mixed …

The ground state of a quantum spin chain is a natural playground for investigating
correlations. Nevertheless, not all correlations are genuinely of quantum nature. Here we …

The total quantum correlation (discord) in Heisenberg dimers is expressed via the spin-spin
correlation function, internal energy, specific heat, or magnetic susceptibility. This allows one …

We review quantum phase transitions of spin systems in transverse magnetic fields taking
the examples of the spin-1/2 Ising and XY models in a transverse field. Beginning with an …