Entanglement molecules

Details Entanglement molecules Entanglement molecules

2000-06-22

arxiv.org/abs/quant-ph/0006105v1

Phys. Rev. A 63, 020303(R) (2001)

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevA.63.020303

We investigate the entanglement properties of multiparticle systems, concentrating on the case where the entanglement is robust against disposal of particles. Two qubits -belonging to a multipartite system- are entangled in this sense iff their reduced density matrix is entangled. We introduce a family of multiqubit states, for which one can choose for any pair of qubits independently whether they should be entangled or not as well as the relative strength of the entanglement, thus providing the possibility to construct all kinds of ''Entanglement molecules''. For some particular configurations, we also give the maximal amount of entanglement achievable.

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