Light-mediated strong coupling between a mechanical oscillator and atomic spins one meter apart

Abstract

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, restricting the range of the coupling to small distances. We use a free-space laser beam to strongly couple a collective atomic spin and a micromechanical membrane over a distance of one 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 engineer 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.

24 pages, 9 figures

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Cited by in corpus (45)

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• Using an atom interferometer to infer gravitational entanglement generation
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• Many-body quantum thermal machines
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• Universal length dependence of tensile stress in nanomechanical string resonators
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• Squeezed light from an oscillator measured at the rate of oscillation
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