论文标题
量子增强的连续波刺激拉曼光谱
Quantum-Enhanced continuous-wave stimulated Raman spectroscopy
论文作者
论文摘要
刺激的拉曼光谱已成为以高灵敏度，分辨率和速度研究分子键的水上动力学的强大工具。然而，目前，最先进的拉曼光谱的灵敏度和速度受到探测拉曼过程的光束射击的限制。在这里，我们通过通过将探测灯的量子噪声降低到射击噪声极限以下，从而增强了连续波刺激的拉曼光谱的灵敏度。用拉曼探测聚合物样品在2950 $ cm^{ - 1} $的情况下以挤压状态进行探测，我们证明了刺激的拉曼信噪比（SNR）的量子增强，相对于Shot-Noise Noise Limited SNR。我们对量子增强拉曼光谱的概念证明为新一代的拉曼显微镜铺平了道路，在这种新一代的拉曼显微镜中，可以在不使用标记的情况下成像弱的拉曼过渡或总计光电功率的增加。
Stimulated Raman spectroscopy has become a powerful tool to study the spatiodynamics of molecular bonds with high sensitivity, resolution and speed. However, sensitivity and speed of state-of-the-art stimulated Raman spectroscopy are currently limited by the shot-noise of the light beam probing the Raman process. Here, we demonstrate 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 $cm^{-1}$ 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 Raman spectroscopy paves the way for 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.
