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Squeezing of atomic resonance fluorescence is shown to be optimized by aproperly designed environment, which can be realized by a quasi-resonantcavity. Optimal squeezing is achieved if the atomic coherence is maximized,corresponding to a pure atomic quantum state. The atomic-state purification isachieved by the backaction of the cavity field on the atom, which increases theatomic coherence and decreases the atomic excitation. For realistic cavities,the coupling of the atom to the cavity field yields a purity of the atomicstate of more than 99%. The fragility of squeezing against dephasing issubstantially reduced in this scenario, which may be important for variousapplications.

Optimal Squeezing in Resonance Fluorescence via Atomic-State Purification