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 …

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 common use in the literature of orthogonal measurements in obtaining quantum discord
for two-qubit states is discussed and compared with more general measurements. We prove …

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

It is known that a reliable geometric quantifier of discord-like correlations can be built by
employing the so-called trace distance, which is used to measure how far the state under …

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 …

We define a new measure of quantum correlations in bipartite quantum systems given by the
Bures distance of the system state to the set of classical states with respect to one …

We propose a measure of nonclassical correlations in bipartite quantum states based on
local unitary operations. We prove that the measure is nonzero if and only if the quantum …

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 …