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.
journal_name
Naturejournal_title
Natureauthors
Delord T,Huillery P,Nicolas L,Hétet Gdoi
10.1038/s41586-020-2133-zsubject
Has Abstractpub_date
2020-04-01 00:00:00pages
56-59issue
7801eissn
0028-0836issn
1476-4687pii
10.1038/s41586-020-2133-zjournal_volume
580pub_type
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