Multipartite entanglement of superpositions

Details Multipartite entanglement of superpositions Multipartite entanglement of superpositions

2007-05-17

arxiv.org/abs/0705.2521v2

Phys. Rev. A 76, 042329 (2007)

Physics

Quantum Physics

4 pages. v2: reference added, text improved in clarity

Scientific paper

10.1103/PhysRevA.76.042329

The entanglement of superpositions [Phys. Rev. Lett. 97, 100502 (2006)] is generalized to the multipartite scenario: an upper bound to the multipartite entanglement of a superposition is given in terms of the entanglement of the superposed states and the superposition coefficients. This bound is proven to be tight for a class of states composed by an arbitrary number of qubits. We also extend the result to a large family of quantifiers which includes the negativity, the robustness of entanglement, and the best separable approximation measure.

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