Quantum discord is a manifestation of quantum correlations due to non-commutativity rather than entanglement. Two measures of quantum discord by the amount of non-commutativity via the trace norm and ...

We study the local indistinguishability problem of quantum states. By introducing an easily calculated quantity, non-commutativity, we present an criterion which is both necessary and sufficient for ...

University of Oxford researchers have experimentally demonstrated 'quadsqueezing', a fourth-order quantum effect previously thought to be out of reach. By combining two simple forces on a single ...