Dynamical entanglement for Fermi coupled stretching and bending modes
Hou Xi-Wen(侯喜文)a) and Cheng Chuan-Ming(成传明)b)
a Department of Physics, Huazhong Normal University, Wuhan 430079, China; b Department of Physics and Electronic Engineering, Yunyang Teachers' College, Danjiangkou 442700, China
Abstract The dynamical entanglement for Fermi coupled C--H stretch and bend vibrations in molecule CHD3 is studied in terms of two negativities and the reduced von Neumann entropy, where initial states are taken to be direct products of photon-added coherent states on each mode. It is demonstrated that the negativity defined by the sum of negative eigenvalues of the partial transpose of density matrices is positively correlated with the von Neumann entropy. The entanglement difference between photon-added coherent states and usual coherent states is discussed as well.
Received: 06 July 2008
Revised: 06 November 2008
Accepted manuscript online:
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