Interplay between anisotropic exchange coupling and the swap operation in the two-qubit Heisenberg XY model

  • Yin W
  • Liang J
  • Yan Q
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Abstract

In this Letter we investigate the interplay between Zeeman splitting and the exchange-induced swap operation in Heisenberg XY model. It is shown that the anisotropic exchange coupling can rule out the swap action even if the magnetic field is homogeneous. The time-evolution of entanglement is also studied and we find that the degree of entanglement of the two spins is suppressed in the presence of inhomogeneous magnetic fields. © 2005 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Anisotropic exchange coupling
  • Entanglement
  • Swap operation
  • XY model

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