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The concurrence of two alternate qubits in a four-qubit Heisenberg XX chainis investigated when a uniform magnetic field B is included. It is found thatthere is no thermal entanglement between alternate qubits if B is close tozero. Magnetic field can induce entanglement in a certain range both for theantiferromagnetic and ferromagnetic cases. Near zero temperature, theentanglement undergoes two sudden changes with increasing value of the magneticfield B. This is due to the changes in the ground state. This novel propertymay be used as quantum entanglement switch. The anisotropy in the system canalso induce the entanglement between two alternate qubits.Comment: 10 pages, 3 figure

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Thermal entanglement between alternate qubits of a four-qubit Heisenberg<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>X</mml:mi><mml:mi>X</mml:mi></mml:mrow></mml:math>chain in a magnetic field

Thermal entanglement between alternate qubits of a four-qubit HeisenbergXXchain in a magnetic field