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Journal Article

Spin-controlled quantum interference of levitated nano rotors


Rusconi,  Cosimo Carlo
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;
MCQST - Munich Center for Quantum Science and Technology, External Organizations;

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Rusconi, C. C., Perdriat, M., Hétet, G., Romero-Isart, O., & Stickler, B. A. (2022). Spin-controlled quantum interference of levitated nano rotors. Physical Review Letters, 129: 093605. doi:10.1103/PhysRevLett.129.093605.

We describe how to prepare an electrically levitated nanodiamond in a superposition of orientations via microwave driving of a single embedded nitrogen-vacancy (NV) center. Suitably aligning the magnetic field with the NV center can serve to reach the regime of ultrastrong coupling between the NV and the diamond rotation, enabling single-spin control of the particle's three-dimensional orientation. We derive the effective spin-oscillator Hamiltonian for small amplitude rotation about the equilibrium configuration and develop a protocol to create and observe quantum superpositions of the particle orientation. We discuss the impact of decoherence and argue that our proposal can be realistically implemented with near-future technology.