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 …

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 …

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 …

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 …

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

Measurements of quantum systems disturb their states. To quantify this nonclassical
characteristic, Zurek and Ollivier [Phys. Rev. Lett. 88, 017901 (2001) PRLTAO 0031-9007 …

Abstract Dakic, Vedral, and Brukner [B. Dakic, V. Vedral, and Č. Brukner, Phys. Rev. Lett.
105, 190502 (2010)] gave a geometric measure of quantum discord in a bipartite quantum …

Quantum discord quantifies nonclassical correlations in a quantum system including those
not captured by entanglement. Thus, only states with zero discord exhibit strictly classical …

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

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 …