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 characterizes “nonclassicality” of correlations in quantum mechanics. It
has been proposed as the key resource present in certain quantum communication tasks …

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 …

Dakic, Vedral, and Brukner [arXiv: 1004.0190 (2010)] introduced a geometric measure of
quantum discord and derived an explicit formula for any two-qubit state. This measure is …

We study the computational complexity of quantum discord (a measure of quantum
correlation beyond entanglement), and prove that computing quantum discord is NP …

We present a reliable algorithm to evaluate quantum discord for general two-qubit states,
amending and extending an approach recently put forward for the subclass of X states. A …

We present an operational interpretation of quantum discord based on the quantum state
merging protocol. Quantum discord is the markup in the cost of quantum communication in …

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 …

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 …