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- W3100597813 abstract "Observing and controlling macroscopic quantum systems has long been a driving force in quantum physics research. In particular, strong coupling between individual quantum systems and mechanical oscillators is being actively studied1–3. Whereas both read-out of mechanical motion using coherent control of spin systems4–9 and single-spin read-out using pristine oscillators have been demonstrated10,11, temperature control of the motion of a macroscopic object using long-lived electronic spins has not been reported. Here we observe a spin-dependent torque and spin-cooling of the motion of a trapped microdiamond. Using a combination of microwave and laser excitation enables the spins of nitrogen–vacancy centres to act on the diamond orientation and to cool the diamond libration via a dynamical back-action. Furthermore, by driving the system in the nonlinear regime, we demonstrate bistability and self-sustained coherent oscillations stimulated by spin–mechanical coupling, which offers the prospect of spin-driven generation of non-classical states of motion. Such a levitating diamond—held in position by electric field gradients under vacuum—can operate as a ‘compass’ with controlled dissipation and has potential use in high-precision torque sensing12–14, emulation of the spin-boson problem15 and probing of quantum phase transitions16. In the single-spin limit17 and using ultrapure nanoscale diamonds, it could allow quantum non-demolition read-out of the spin of nitrogen–vacancy centres at ambient conditions, deterministic entanglement between distant individual spins18 and matter-wave interferometry16,19,20. Coupling the spins of many nitrogen–vacancy centres in a trapped diamond to its orientation produces a spin-dependent torque and spin-cooling of the motion of the diamond." @default.
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- W3100597813 date "2020-03-23" @default.
- W3100597813 modified "2023-10-18" @default.
- W3100597813 title "Spin-cooling of the motion of a trapped diamond" @default.
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- W3100597813 doi "https://doi.org/10.1038/s41586-020-2133-z" @default.
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