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Hybrid quantum systems that combine complementary physical platforms offer a promising route toward devices capable of simultaneously storing, processing, and transmitting quantum information.[1] In our experiment, we combine a spin-polarized ultracold atomic ensemble and a membrane optomechanical system to realize such a hybrid platform. We engineer coherent interactions between the two systems over a macroscopic distance of 2 meters, mediated by a free-space laser beam in a loop geometry.[2] The collective atomic spin couples to light via the Faraday interaction, while the membrane couples via radiation pressure, together enabling a bidirectional long-distance coupling. Having recently achieved quantum noise limited interactions for both systems individually,[3] the platform is now within reach of exploring quantum coherent coupling and the execution of protocols such as state swaps, ground-state cooling of the mechanical oscillator, and EPR entanglement generation.
- Kurizki, G. et al. Quantum technologies with hybrid systems. Proceed-
ings of the National Academy of Sciences 112, 3866–3873 (2015). - Karg, T. M. et al. Light-mediated strong coupling between a mechanical
oscillator and atomic spins 1 meter apart. Science 369, 174–179 (2020). - Schmid, G.-L. et al. Squeezing light with optomechanical and spin-light
quantum interfaces. Comptes Rendus Physique 26, 641–657 (2025).