Year: 2016
Type: article
Abstract: We report quantum enhancement of Faraday rotation spin noise spectroscopy by polarization squeezing of the probe beam. Using natural abundance Rb in 100 Torr of ${\mathrm{N}}_{2}$ buffer gas and squeezed light from a subthreshold optical parametric oscillator stabilized 20 GHz to the blue of the ${D}_{1}$ resonance, we observe that an input squeezing of 3.0 dB improves the signal-to-noise ratio by 1.5 to 2.6 dB over the combined (power)$\ensuremath{\bigotimes}$(number density) ranges (0.5--4.0 mW)$\ensuremath{\bigotimes}(1.5\ifmmode\times\else\texttimes\fi{}{10}^{12}\phantom{\rule{0.16em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}3}$ to $1.3\ifmmode\times\else\texttimes\fi{}{10}^{13} {\mathrm{cm}}^{\ensuremath{-}3}$), covering the ranges used in optimized spin noise spectroscopy experiments. We also show that squeezing improves the tradeoff between statistical sensitivity and broadening effects, a previously unobserved quantum advantage.
Source: Physical Review A
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2999500758, G8904686271
OpenAlex ID: W2235410147