Abstract
We theoretically demonstrate the influence of dark states on single-mode and two-mode optical squeezing in a four-level atomic–cavity coupling system through fifth- and third-order cascade nonlinearity. We first show the cone emissions of self-diffraction and phase-conjugate spontaneous parametric (SP) four-wave mixing processes. Then, we inject a coherent or Einstein–Podolsky–Rosen field into the SP-MWM channels to investigate the corresponding squeezing. The investigations have potential applications in quantum information processing.
© 2014 Optical Society of America
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