Reply to the comment on `` Manipulating the frequency-entangled states   by an acoustic-optical modulator''
  In the paper [1], authors claim that the scheme for entanglement swapping using an acoustic-optical modulator [2] is flaw. In this reply, we show there is a trivial mistake in the scheme [2], but the main conclusion is still correct, that is, the acoustic-optical modulator can be used to manipulate the frequency-entangled state. 
B.-S Shi, Y.-K Jiang and G.-C Guo