Lower bounds on concurrence and negativity from a trace inequality
MODERN PHYSICS LETTERS A(2020)
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.
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Key words
Entanglement measures,concurrence,negativity,separability
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