Journal
SCIENCE
Volume 369, Issue 6500, Pages 174-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abb0328
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Funding
- project Modular mechanical-atomic quantum systems (MODULAR) of the European Research Council (ERC)
- Swiss Nanoscience Institute (SNI)
- DFG [CRC 1227 DQ-mat]
- cluster of excellence Quantum Frontiers
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Engineering strong interactions between quantum systems is essential for many phenomena of quantum physics and technology. Typically, strong coupling relies on short-range forces or on placing the systems in high-quality electromagnetic resonators, which restricts the range of the coupling to small distances. We used a free-space laser beam to strongly couple a collective atomic spin and a micromechanical membrane over a distance of 1 meter in a room-temperature environment. The coupling is highly tunable and allows the observation of normal-mode splitting, coherent energy exchange oscillations, two-mode thermal noise squeezing, and dissipative coupling. Our approach to engineering coherent long-distance interactions with light makes it possible to couple very different systems in a modular way, opening up a range of opportunities for quantum control and coherent feedback networks.
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