Realization of low frequency and controllable bandwidth squeezing based on a four-wave-mixing amplifier in rubidium vapor Liu, Cunjin ; Jing, Jietai ; Zhou, Zhifan ; Pooser, Raphael C. ; Hudelist, Florian ; Zhou, Lu. ; Zhang, Weiping Abstract Publication: Optics Letters Pub Date: August 2011 DOI: 10.1364/OL.36.002979 Bibcode: 2011OptL...36.2979L