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 yon Neumann entropy, where initial states are taken to be direct pr...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 yon 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.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No 10675050)
文摘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 yon 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.