Sommaire:

Observing and controlling macroscopic quantum systems has long been a driving force in research on quantum physics. In this endeavor, coupling individual quantum systems to mechanical oscillators is of great interest. While both read-out of mechanical motion using two-level spin systems and spin read-out using oscillators have been demonstrated, temperature control of the motion of a macroscopic object using electronic spins is still a daunting task. We will present our observations of spin-dependent torque and dynamical back-action from a micro-diamond levitating in a Paul Trap [2]. Using a combination of microwave and laser excitation enables the spin of nitrogen-vacancy centers to act on the diamond orientation and to observe cooling of the diamond libration. Further, driving the system in the non-linear regime, we demonstrate bistability and self-sustained lasing of the librational mode. The final temperature is currently limited by microwave excitation on the blue side of the spin-resonance since the trapping frequency is lower than the spin decoherence rate. We discuss ways to achieve spin-cooling to the ground state and present first steps towards a platform that uses levitating magnets and CVD grown diamond samples in order to reach the sideband resolved regime [3].

[1] Delord T. et al. Phys. Rev. Lett. 121 053602 (2018)
[2] Delord T., et al. arXiv :1905.11509 (2019)
[3] Huillery P. et al. ArXiv 1903.09699 (2019)

Pour plus d'informations, merci de contacter Jacques V.