Thermal entanglement of spins in an inhomogeneous magnetic field

Thermal entanglement of spins in an inhomogeneous magnetic field

We study the effect of inhomogeneities in the magnetic field on the thermal entanglement of a two-spin system. We show that in the ferromagnetic case a very small inhomogeneity is capable of producing large values of thermal entanglement. This shows that the absence of entanglement in the ferromagne...

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Veröffentlicht in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2005-02, Vol.71 (2), Article 022308
Hauptverfasser: Asoudeh, M., Karimipour, V.
Format: Artikel
Sprache:eng
Schlagworte:
ATOMIC AND MOLECULAR PHYSICS
CORRELATIONS
ENERGY LEVELS
FERROMAGNETISM
HEISENBERG MODEL
MAGNETIC FIELDS
MATERIALS SCIENCE
QUANTUM MECHANICS
QUANTUM NUMBERS
SOLIDS
SPIN
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Zusammenfassung:We study the effect of inhomogeneities in the magnetic field on the thermal entanglement of a two-spin system. We show that in the ferromagnetic case a very small inhomogeneity is capable of producing large values of thermal entanglement. This shows that the absence of entanglement in the ferromagnetic Heisenberg system is highly unstable against inhomogeneity of magnetic fields, which is inevitably present in any solid state realization of qubits.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.71.022308