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Phys. Rev. Lett. 68, 3020 - 3023 (1992)

Spectroscopy with squeezed light

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E. S. Polzik, J. Carri, and H. J. Kimble
Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125

Received 29 January 1992

A frequency-tunable source of squeezed light is employed for spectroscopic measurements of atomic cesium. Relative to the usual quantum limit associated with vacuum-state fluctuations, enhanced sensitivity is demonstrated for the detection of Doppler-free resonances in saturation spectroscopy, with an improvement of 3.1 dB directly observed and 3.8 dB inferred after correcting for detector thermal noise.


©1992 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.68.3020
DOI: 10.1103/PhysRevLett.68.3020
PACS: 42.62.Fi, 32.80.-t, 42.50.Dv

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