Maximizing the entanglement of two mixed qubits
William J. Munro, Daniel F. V. James, Andrew G. White, Paul G. Kwiat · Physical Review A · 2001
Two-qubit states occupy a large and relatively unexplored Hilbert space. Such states can be succinctly characterized by their degree of entanglement and purity. In this article we investigate entangled mixed states and present a class of states that have the maximum amount of entanglement for a given linear entropy.