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Monogamy inequality and residual entanglement of three qubits under decoherence
Registro en:
Physical Review A. Amer Physical Soc, v. 80, n. 2, 2009.
1050-2947
WOS:000269638200062
10.1103/PhysRevA.80.022331
Autor
de Oliveira, TR
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Exploring an analytical expression for the convex roof of the pure state squared concurrence for rank 2 mixed states the entanglement of a system of three particles under decoherence is studied, using the monogamy inequality for mixed states and the residual entanglement obtained from it. The monogamy inequality is investigated both for the concurrence and the negativity in the case of local independent phase damping channel acting on generalized Greenberger-Horne-Zeilinger states of three particles and the local independent amplitude damping channel acting on generalized |W >=|001 >+|010 >+|100 > state of three particles. It is shown that the bipartite entanglement between one qubit and the rest has a qualitative similar behavior to the entanglement between individual qubits, and that the residual entanglement in terms of the negativity cannot be a good entanglement measure for mixed states, since it can increase under local decoherence. 80 2 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) FAPESP [2008-03557-8]