Phys. Rev. Lett. 81, 3635–3638 (1998)Observation of Squeezing in the Phase-Dependent Fluorescence Spectra of Two-Level AtomsReceived 18 June 1998; published in the issue dated 26 October 1998 We observe squeezing in the phase-dependent fluorescence spectra of two-level atoms that are coherently driven by a near-resonant laser field in free space. In contrast to previous predictions that emphasized the in- and out-of-phase quadratures, we find that maximum squeezing occurs for homodyne detection at a phase near ±45∘ relative to the exciting field. A new physical picture of phase-dependent noise is developed that incorporates quantum collapses into a Bloch vector model and yields a very simple form for the complete squeezing spectrum. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.3635
DOI:
10.1103/PhysRevLett.81.3635
PACS:
42.50.Lc, 32.80.-t
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