Abstract
We report on an experimental study of vacuum- induced suppression and enhancement of four-wave mix- ing (FWM) signal in a composite atom-cavity system. By scanning the additional dressing field, the suppression ratio of the FWM signal can reach 90 % compared with 40 % without cavity. We attribute the enhanced suppression and enhancement to the atom-cavity coupling arising from a vacuum-induced Raman process, which amplifies the dressing effect from the additional field. Also, the dress - ing asymmetry of the atom-cavity coupling is discussed and used to estimate the nonlinearity of atomic medium in the cavity. The suppression and enhancement can be inter- preted by a dressed-state picture and agree with theoreti- cal calculations. The investigation may find applications in optical switch and quantum memory controlled by cavity.
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