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Low-frequency vacuum squeezing via polarization self-rotation in Rb vapor

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Abstract

We observed squeezed vacuum light at 795nm in Rb87 vapor via resonant polarization self-rotation and report noise sidebands suppression of 1dB below shot-noise level spanning from 30kHz to 1.2MHz frequencies. To our knowledge, this is the first demonstration of submegahertz quadrature vacuum squeezing in atomic systems. The spectral range of observed squeezing matches well typical bandwidths of electromagnetically induced transparency (EIT) resonances, making this simple technique for generation of optical fields with nonclassical statistics at atomic transitions wavelengths attractive for EIT-based quantum information protocols applications.

© 2008 Optical Society of America

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