Analysis of quantum precision measurement based on weak-value-amplification technique

Analysis of the controversial issue of whether weak-value-amplification (WVA) technique can be superior to conventional standard scheme is presented．Fisher information is used to characterize measurement precision when applying the Gaussian meter and optical coherence state as a meter．It is found that WVA scheme of using Gaussian meter could at most reach the same precision as conventional measurement．However, WVA scheme of using optical coherent state as meter could outperform conventional method．