Thermal and ground-state entanglement in Heisenberg $XX$ qubit rings

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  • 28 March 2002
Abstract
We study the entanglement of thermal and ground states in Heisernberg XX qubit rings with a magnetic field. A general result is found that for even-number rings pairwise entanglement between two nearest qubits is independent on both the sign of exchange interaction constants and the sign of magnetic fields. As an example we study the entanglement in the four-qubit model and find that the ground state for this model without magnetic fields is shown to be a genuinely four-body maximally entangled state.

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