Université Toulouse III - Paul Sabatier - Bat. 3R4 - 118 route de Narbonne - 31062 Toulouse Cedex 09 - France

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The nanofiber - cold atom platform : A tool for studying light-matter interaction and prospects for interfacing ultracold molecules

The interaction between light and two-level quantum emitters is a fundamental process in quantum optics. A defining feature of this process is antibunching, i.e., two photons are never detected simultaneously when scattered by a single quantum emitter. This phenomenon is typically explained by the fact that a single two-level quantum emitter can only absorb and emit single photons. In this seminar, I will present a complementary picture supported by two experimental studies [1,2] that demonstrate that photon antibunching arises from quantum interference between two types of two-photon scattering processes, namely coherent and incoherent scattering.

These results were obtained with laser-cooled atoms interfaced with a tapered optical fiber, or nanofiber. Interestingly, the nanofiber platform has been recently proposed to interface ultracold molecules [3], whose complexity opens up new possibilities in fundamental science. I will briefly introduce the challenges and opportunities of ultracold molecules referring to our work in Florence [4]. Finally, I will discuss how I envision assembling ultracold molecules using nanofibers.

Références :
[1] Masters, et al. "Photon Antibunching in Two-Level Quantum Emitters." Nat. Photonics, 2023.
[2] Cordier*, Schemmer*, et al. "Quantum Interference in Two-Photon Scattering Processes." PRL, 2023.
[3] Márquez-Mijares, et al. "Interfacing Ultracold Molecules with Nanofibers." Physica Scripta, 2023.
[4] Finelli, et al. 2024, "Ultracold LiCr : A New Pathway to Quantum Gases of Paramagnetic Polar Molecules", PRX Quantum