Phys. Rev. A 66, 034302 (2002) [4 pages]Thermal and ground-state entanglement in Heisenberg XX qubit ringsReceived 2 April 2002; published 12 September 2002 We study the entanglement of thermal and ground states in the Heisenberg XX qubit rings with a magnetic field. A general result is found that for even-number rings, pairwise entanglement between nearest-neighbor qubits is independent of 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 of this model without magnetic fields is shown to be a four-body maximally entangled state measured by the square N-bit concurrence. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.034302
DOI:
10.1103/PhysRevA.66.034302
PACS:
03.67.Hk, 03.65.Ud, 75.10.Jm
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