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 information theory is built upon the realisation that quantum resources like
coherence and entanglement can be exploited for novel or enhanced ways of transmitting …

It has recently been pointed out that the geometric quantum discord, as defined by the
Hilbert-Schmidt norm (2-norm), is not a good measure of quantum correlations, since it may …

Quantum discord is a measure of quantum correlation beyond entanglement. Computing
quantum discord for simple quantum states is a basic problem. An analytical formula of …

Correlations are a very important tool in the study of multipartite systems, for both classical
and quantum ones. The discussion about the quantum nature of correlations permeates …

We present two formulae to calculate quantum discord, a kind of quantum correlation,
between a qubit and a second party of arbitrary dimension d. The first formula is the original …

We evaluate analytically the quantum discord for a large family of multiqubit states. It is
interesting to note that the quantum discord of three qubits and five qubits is the same, as is …

We study dynamics of nonclassical correlations by exactly solving a model consisting of two
atomic qubits with spontaneous emission. We find that the nonclassical correlations defined …

It is shown that the dissonance, a quantum correlation which is equal to quantum discord for
separable state, is required for assisted optimal state discrimination. We find that only one …