Levitated Electro-Optomechanics with Charged Nanoparticles

• Applicant: Dr. Benjamin Stickler
• Subject Area: Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas
• Term: from 2018 to 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 411042854

This project aims at developing the theoretical framework required to exploit electric circuitry for cooling and manipulating the quantum state of a levitated charged nanoparticle. Specifically, our objectives can be summarized by three main goals: (i) We will formulate the theory for combined electro-optic cooling of the motion and rotation of electrically charged nanoscale particles levitated in a Paul trap by combining resistive cooling with optical cavity and feedback cooling techniques. The quantum description of the ensuing coupled circuit-particle dynamics will predict how the motional state of such a particle can be prepared in the deep quantum regime even with objects too small for established optical techniques. (ii) We will derive the Markovian quantum master equations of charge-induced spatio-orientational decoherence due to the induction of mirror charges and currents in the electrodes, Coulomb scattering of ions, and adsorption or emission of charges. Apart from their fundamental importance, the resulting decoherence rates are relevant for any quantum technology based on micro-mechanical devices since residual charges and their inhomogeneous distribution are impossible to avoid. (iii) We will propose an experimentally feasible interference protocol to test the quantum superposition principle with an electrically levitated massive particle. By circumventing the need of microgravity for high-mass interference and by significantly reducing the experimental requirements, such a scheme will be instrumental for future quantum technology and fundamental experiments with charged levitated nanoparticles.

• DFG Programme: Research Grants
• Co-Investigator: Professor Dr. Klaus Hornberger