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 …

Quantum discord, a kind of quantum correlation, is defined as the difference between
quantum mutual information and classical correlation in a bipartite system. In general, this …

We study the dynamics of quantum and classical correlations in the presence of
nondissipative decoherence. We discover a class of initial states for which the quantum …

We propose a global measure for quantum correlations in multipartite systems, which is
obtained by suitably recasting the quantum discord in terms of relative entropy and local von …

It is well known that many operations in quantum information processing depend largely on
a special kind of quantum correlation, that is, entanglement. However, there are also …

Quantum discord provides a measure for quantifying quantum correlations beyond
entanglement and is very hard to compute even for two-qubit states because of the …

The set of Bell-diagonal states for two qubits can be depicted as a tetrahedron in three
dimensions. We consider the level surfaces of entanglement and quantum discord for Bell …

We investigate pairwise quantum correlation as measured by the quantum discord as well
as its classical counterpart in the thermodynamic limit of anisotropic XY spin-1/2 chains in a …

We analyze the optimal measurements to access classical correlations in arbitrary two-qubit
states. Two-qubit states can be transformed into the canonical forms via local unitary …