Journal
PHYSICAL REVIEW A
Volume 93, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.93.053802
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Funding
- Spanish MINECO [FIS2011-23520, FIS2014-62181-EXP, Catalan 2014-SGR-1295]
- European Research Council project AQUMET
- Fundacio Privada CELLEX
- Marie Curie COFUND fellowship
- Horizon FET Proactive project QUIC
- ICREA Funding Source: Custom
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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 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)circle times(number density) ranges (0.5-4.0 mW)circle times(1.5 x 10(12) cm(-3) to 1.3 x 10(13) cm(-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.
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