Optimizing entanglement in two-qubit systems

Abstract: We investigate entanglement in two-qubit systems using a geometric representation based on the minimum of essential parameters. The latter is achieved by requiring subsystems with the same entropy, regardless of whether the state of the entire system is pure or mixed. The geometric framework is provided by a convex set S that forms a right-triangle, whose points are linked to just two of the coherences of the system under study. As a result, we find that optimized states of two qubits are X-shaped and host pairs of identical populations while reducing the number of coherences involved. A geometric L-measure of entanglement is introduced as the distance between the points in S that represent entangled states and the closest point that defines separable states. It is shown that L reproduces the results of the Hill-Wootters concurrence C, so that C can be interpreted as a distance-like entanglement measure. However, unlike C, the measure L also distinguishes the rank of states. The universality of the two-qubit X-states ensures the utility of our geometric model for studying entanglement of two-qubit states in any configuration. To show the applicability of our approach far beyond time-independent cases, we construct a time-dependent two-qubit state, traced out over the complementary components of a pure tetra-partite system, and find that its one-qubit states share the same entropy. The entanglement measure results bounded from above by the envelope of the minima of such entropy.