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 …

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 …

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

Quantum discord, a measure of genuinely quantum correlations, is generalized to
continuous variable systems. For all two-mode Gaussian states, we calculate analytically the …

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

In this tutorial, we introduce the basic concepts and mathematical tools needed for phase-
space description of a very common class of states, whose phase properties are described …

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 quantifies nonclassical correlations beyond the standard classification of
quantum states into entangled and unentangled. Although it has received considerable …

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 …