Lower bounds on concurrence and negativity from a trace inequality

Abstract

For bipartite quantum states we obtain lower bounds on two important entanglement measures, concurrence and negativity, studying the inequalities for the expectation value of a projector on some subspace of the Hilbert space. Several applications, including analysis of stability of entanglement under various perturbations of a state, are discussed.

14 pages

References in corpus (3)

• Entanglement detection
• Concurrence of arbitrary dimensional bipartite quantum states
• Partial transpose as a direct link between concurrence and negativity