In this paper, we use the concurrence vector as a measure of entanglement, and investigate lower and upper bounds on the concurrence of a superposition of bipartite states as a function of the concurrence of the superposed ...

It is shown that for a given bipartite density matrix and by choosing a suitable

separable set (instead of a product set) on the separable–entangled boundary, the

optimal Lewenstein–Sanpera (LS) decomposition ...

We propose a simple geometrical approach for finding robustness of entanglement for Bell decomposable

states of two-qubit quantum systems. It is shown that for these states robustness is equal to

the concurrence. ...

For a given pure state of amultipartite system, the concurrence vector is defined

by employing the defining representation of generators of the corresponding

rotation groups. The norm of a concurrence vector ...