Coherent matter-wave emission from polaritonic quantum matter in an optical lattice

With the recent development of polaritonic quantum systems and their promise for future quantum technologies, a fundamental understanding of their physics is highly desirable, especially out of equilibrium. Recently, we have implemented a versatile experimental platform for studying polariton physics with a state-selective optical lattice [1], in which the roles of matter and photons are played by lattice-trapped atoms and free matter-waves, respectively. In this talk, we report new work on coherent matter-wave emission from such radiatively coupled quantum matter. We study new regimes of polariton physics in a dissipation-free environment, including directional matter-wave emission, super- and subradiance with delayed feedback, and spontaneous coherence formation in the strongly-interacting regime.

[1] J. Kwon, Y. Kim, A. Lanuza, D. Schneble, “Formation of matter-wave polaritons in an optical lattice”, Nat. Phys. 18, 657-661 (2022).