A two-mode squeezed light based on a double-pump phase-matching geometry
He Xuan-Jian1, Jia Jun1, Jiao Gao-Feng1, Chen Li-Qing1, †, Yuan Chun-Hua1, 3, ‡, Zhang Wei-Ping2, 3
       

Double-Λ scheme on the D1 line of 85Rb configuration for the generation of (a) the frequency non-degenerate and (b) frequency degenerate squeezed lights. The state |g,m⟩ involves the hyperfine levels |5S1/2, F = 2,3⟩. The hyperfine splitting of the excited state is not resolved due to Doppler broadening.