Thermal entanglement in the two-qubit Heisenberg XY model under a nonuniform external magnetic field

Journal Article · Wed Oct 01 00:00:00 EDT 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.044301· OSTI ID:20640417

Yang, Sun; Yuguang, Chen; Hong, Chen ^[1]

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1. Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092 (China)

We investigate the thermal entanglement in the two-qubit Heisenberg XY model with a nonuniform magnetic field. Concurrence, the measurement of entanglement, is calculated. The behavior of concurrence is present at three different cases. Contrary to the uniform magnetic field case, we find that the entanglement and the critical temperature T{sub C} may be enhanced under a nonuniform magnetic field.

• OSTI ID: 20640417
• Journal Information: Physical Review. A, Vol. 68, Issue 4; Other Information: DOI: 10.1103/PhysRevA.68.044301; (c) 2003 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
CORRELATIONS
CRITICAL TEMPERATURE
ENERGY LEVELS
HEISENBERG MODEL
INFORMATION THEORY
MAGNETIC FIELDS
QUANTUM MECHANICS