title: Realization of low frequency and controllable bandwidth squeezing based on a four-wave-mixing amplifier in rubidium vapor.
abstract: We experimentally demonstrate the creation of two correlated beams generated by a nondegenerate four-wave-mixing amplifier at λ=795 nm in hot rubidium vapor. We achieve intensity difference squeezing at frequencies as low as 1.5 kHz which is so far the lowest frequency to observe squeezing in an atomic system. The squeezing spans from 5.5 to 16.5 MHz with a maximum squeezing of -5 dB at 1 MHz. We can control the squeezing bandwidth by changing the pump power. Both low frequency and controllable bandwidth squeezing show great potential in sensitivity detection and precise control of the atom optics measurement.
authors.affiliation: State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai, 200062, China.
authors.forename: Cunjin
authors.initials: C
authors.lastname: Liu
authors.forename: Jietai
authors.initials: J
authors.lastname: Jing
authors.forename: Zhifan
authors.initials: Z
authors.lastname: Zhou
authors.forename: Raphael C
authors.initials: RC
authors.lastname: Pooser
authors.forename: Florian
authors.initials: F
authors.lastname: Hudelist
authors.forename: Lu
authors.initials: L
authors.lastname: Zhou
authors.forename: Weiping
authors.initials: W
authors.lastname: Zhang