Eur. Phys. J. D 49, 37-41 (2008)
https://doi.org/10.1140/epjd/e2008-00134-y

Comparative study of linear entropy and negativity in molecular vibrations

¹ Department of Physics, Huazhong Normal University, Wuhan 430079, P.R. China
² Department of Information Management, Huazhong Normal University, Wuhan 430079, P.R. China
³ School of Natural Science, Wuhan University of Technology, Wuhan 430079, P.R. China
⁴ Institute of High Energy Physics, P.O. Box 918(4), Beijing 100049, P.R. China

Corresponding author: ^a xwhou@phy.ccnu.edu.cn

Received: 19 October 2007
Revised: 17 December 2007
Published online: 11 July 2008

Abstract

The dynamical comparison of entanglement, measured by linear entropy and negativity, is carried out for initial pure separable states in vibrations of H₂O and SO₂. It is shown that both measures of an initial state with local-mode character have the same period for H₂O, while those of an initial state with normal-mode character are no longer identical in period. When the total quantum number of the initial state is one, both measures rise and lower together with the period for H₂O being larger than that for SO₂. For a suitable state in H₂O, both measures exhibit a beat phenomenon with a long period.