Interfacing a single spin qubit in diamond with the motion of levitated micron magnets

Levitated objects have been widely used in fundamental science and engineering. The recent ability to cool and control levitated particles in the quantum regime provides new opportunities to couple levitated objects to other quantum platforms. In this talk, I will report the levitation of a micron Nd magnet over a 500 nm thin film YBCO superconductor. The librational motion of the magnet is monitored optically, whose frequency is around 51 kHz with a quality factor around 1e5. A diamond membrane is placed in between the magnet and the superconductor. Individual Nitrogen vacancy (NV) centers in the membrane are coupled to different motions of the levitated magnet. We measured the coupling rate between a single electron spin to the librational mode around 10 Hz via the Hann-echo pulse sequence. I will also briefly discuss our efforts towards understanding the dissipation mechanism in the magnetically levitated system. Our approach provides a new path towards interfacing solid spin qubits with motional degrees of freedom for future quantum information processing and quantum sensing applications.