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Bulletin of the American Physical Society

Sensitivity, quantum limits, and quantum enhancement of noise spectroscopies

Morgan W. Mitchell, Vito Giovanni Lucivero, Aleksandra Dimić, Jia Kong, Ricardo Jiménez-Martínez

Published Mar 14, 2017• 0 citations
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Stimulated Raman spectroscopy has become a powerful tool to study the spatio-dynamics of molecular bonds with high sensitivity, resolution, and speed. However, the sensitivity and speed of stimulated Raman spectroscopy are ultimately limited by the shot-noise of the light beam probing the Raman process. Here, we demonstrate an enhancement of the sensitivity of stimulated Raman spectroscopy by reducing the noise below the shot-noise limit by means of squeezed states of light. Our demonstration constitutes the first step towards a new generation of quantum-enhanced Raman microscopes.
Brillouin spectroscopy and microscopy is widely used for remote sensing and imaging; however, the sensitivity of detection is often limited due to the available laser power for such measurements. Quantum light offers an alternative solution to such spectroscopy and imaging by reducing the noise below the classical shot-noise limit. We demonstrate the first results of Brillouin spectroscopy and imaging using quantum-enhanced detection and outline potential applications and future strategies for improved detection sensitivity.
Stimulated Raman spectroscopy has become a powerful tool to study the spatiodynamics of molecular bonds with high sensitivity, resolution, and speed. However, the sensitivity and speed of state-of-the-art stimulated Raman scattering spectroscopy are currently limited by the shot-noise of the light beam probing the Raman process. Here, we demonstrate in a proof-of-principle experiment an enhancement of the sensitivity of continuous-wave stimulated Raman spectroscopy by reducing the quantum noise of the probing light below the shot-noise limit by means of amplitude squeezed states of light. Probing polymer samples with Raman shifts around 2950 c m − 1 with squeezed states, we demonstrate a quantum enhancement of the stimulated Raman signal-to-noise ratio (SNR) of 3.60 dB relative to the shot-noise limited SNR. Our proof-of-concept demonstration of quantum-enhanced continuous-wave Raman spectroscopy paves the way for more elaborate demonstrations using state-of-the-art stimulated Raman scattering microscopes, and thus constitutes the very first step towards a new generation of Raman microscopes, where weak Raman transitions can be imaged without the use of markers or an increase in the total optical power.