Abstract
Using a quantum theory for an ensemble of three-level atoms $(\ensuremath{\Lambda})$ placed in an optical cavity and driven by electromagnetic fields, we show that the long-lived spin associated with the ground-state sublevels can be squeezed. Two kinds of squeezing are obtained: self-spin squeezing, when the input fields are coherent states and the atomic ensemble exhibits a large nonlinearity; squeezing transfer approaching 100%, when one of the incoming fields is squeezed.
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