Abstract
We report experimental studies of bright-state polaritons of four-wave mixing (FWM) and six-wave mixing (SWM) signals through cascade nonlinear optical parametric amplification processes in an atom-cavity composite system for the first time. Also, the coexisting cavity transmission modes of parametrically amplified FWM and SWM signals are observed. Finally, electromagnetically induced absorption by the FWM cavity modes in the probe beam is investigated. The investigations can find potential applications in multi-channel narrow-band long-distance quantum communication.
Highlights
We report experimental studies of bright-state polaritons of four-wave mixing (FWM) and six-wave mixing (SWM) signals through cascade nonlinear optical parametric amplification processes in an atom-cavity composite system for the first time
When the atomic system is in the double-L configuration, correlated photon pairs with high generation rate and narrow bandwidth have been generated[8] in the cold atomic ensemble by using an optical parametric amplification (OPA) process operated below its oscillation threshold
Four-wave mixing (FWM) and six-wave mixing (SWM) processes based on third-order and fifth-order nonlinear processes in electromagnetically induced transparency (EIT) media[11,12,13] have attracted lots of attention in recent years, in which a strong coupling beam renders a resonant, opaque medium nearly transparency while enhancing the nonlinearity, and the coexistence of these two nonlinear processes due to double EIT windows and atomic coherences has been reported[14,15]
Summary
Is still generated at the center of the atomic cell and propagate along the optical axis of the cavity, so they are mode-matched to the cavity and form the cavity modes. According to the expression of aF1 given in the Method part, Fig. 1(c) shows the calculated normalized CTS versus Dac (defined as Dac 5 V1 2 vc with vc being the resonant frequency of the cavity) and D1, which exhibits a double-peak structure along the D1 direction. This structure indicates the cavity polaritons[7] of the parametrically amplified field EAF1, which results from thepcffioffiffiuffi pling between the cavity mode of EAF1 and atoms with strength g N, where g is the single-atom-cavity coupling strength, and N is the number of atoms in the cavity.
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