Thermal entanglement in a two-qubit Heisenberg XXZ spin chain under an inhomogeneous magnetic field

Journal Article · Thu Sep 15 00:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.034302· OSTI ID:20718640

Guofeng, Zhang ^[1]; Shushen, Li ^[1]

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1. State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P. O. Box 912, Beijing 100083 (China)

The thermal entanglement in a two-qubit Heisenberg XXZ spin chain is investigated under an inhomogeneous magnetic field b. We show that the ground-state entanglement is independent of the interaction of z-component J{sub z}. The thermal entanglement at the fixed temperature can be enhanced when J{sub z} increases. We strictly show that for any temperature T and J{sub z}, the entanglement is symmetric with respect to zero inhomogeneous magnetic field, and the critical inhomogeneous magnetic field b{sub c} is independent of J{sub z}. The critical magnetic field B{sub c} increases with the increasing |b| but the maximum entanglement value that the system can arrive at becomes smaller.

• OSTI ID: 20718640
• Journal Information: Physical Review. A, Vol. 72, Issue 3; Other Information: DOI: 10.1103/PhysRevA.72.034302; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
36 MATERIALS SCIENCE
GROUND STATES
HEISENBERG MODEL
MAGNETIC FIELDS
QUANTUM COMPUTERS
QUANTUM ENTANGLEMENT
QUBITS
SPIN