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Phys Rev Lett. 2001 Jan 29;86(5):910-3.

Persistent entanglement in arrays of interacting particles.

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  • 1Sektion Physik, Ludwig-Maximilians-Universit√§t, Theresienstrasse 37, D-80333 M√ľnchen, Germany.


We study the entanglement properties of a class of N-qubit quantum states that are generated in arrays of qubits with an Ising-type interaction. These states contain a large amount of entanglement as given by their Schmidt measure. They also have a high persistency of entanglement which means that approximately N/2 qubits have to be measured to disentangle the state. These states can be regarded as an entanglement resource since one can generate a family of other multiparticle entangled states such as the generalized Greenberger-Horne-Zeilinger states of <N/2 qubits by simple measurements and classical communication.

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