SLOCC orbit of rank-deficient two-qubit states: quantum entanglement, quantum discord and EPR steering

摘要

We study selected aspects of non-classical correlations of arbitrary states from the stochastic local operations and classical communication orbit of rank-deficient two-qubit states. In particular, we find explicitly entanglement of formation and quantum discord for these states. Moreover, we determine and analyze the Einstein-Podolsky-Rosen steering ellipsoids corresponding to these states.