Tarrago Velez Santiago, Sudhir Vivishek, Sangouard Nicolas, Galland Christophe
Institue of Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Sci Adv. 2020 Dec 18;6(51). doi: 10.1126/sciadv.abb0260. Print 2020 Dec.
Time-resolved Raman spectroscopy techniques offer various ways to study the dynamics of molecular vibrations in liquids or gases and optical phonons in crystals. While these techniques give access to the coherence time of the vibrational modes, they are not able to reveal the fragile quantum correlations that are spontaneously created between light and vibration during the Raman interaction. Here, we present a scheme leveraging universal properties of spontaneous Raman scattering to demonstrate Bell correlations between light and a collective molecular vibration. We measure the decay of these hybrid photon-phonon Bell correlations with sub-picosecond time resolution and find that they survive over several hundred oscillations at ambient conditions. Our method offers a universal approach to generate entanglement between light and molecular vibrations. Moreover, our results pave the way for the study of quantum correlations in more complex solid-state and molecular systems in their natural state.
时间分辨拉曼光谱技术提供了多种方法来研究液体或气体中分子振动的动力学以及晶体中的光学声子。虽然这些技术能够获取振动模式的相干时间，但它们无法揭示在拉曼相互作用过程中光与振动之间自发产生的脆弱量子关联。在此，我们提出一种利用自发拉曼散射的普遍特性的方案，以证明光与集体分子振动之间的贝尔关联。我们以亚皮秒时间分辨率测量这些混合光子 - 声子贝尔关联的衰减，发现在环境条件下它们能在数百次振荡中存活。我们的方法提供了一种在光与分子振动之间产生纠缠的通用方法。此外，我们的结果为研究处于自然状态的更复杂固态和分子系统中的量子关联铺平了道路。
