Comment on ``Geometric phase of entangled spin pairs in a magnetic field''
arXiv:0708.0292 · doi:10.1103/PhysRevA.76.036101
Abstract
The degree of entanglement between two spins may change due to interaction. About this we find that a wrong result in a recent work by Ge and Wadati [Phys. Rev. A {\bf72}, 052101(2005)] which breach the basic principle.
2 pages, comment on Phys. Rev. A {\bf72}, 052101(2005), and to appear in Phys. Rev. A