  Gong points out [quant-ph arXiv:1106.0062] a "direct connection" between our
measure [PRL 106, 220401 (2011)] recently proposed to quantify macroscopic
quantum superpositions and a previously studied quantity introduced to study
classical and quantum chaos. We point out that the two measures are obviously
different for some mixed states, and the previous one does not work as a
sensible measure to quantify quantum superpositions.
