Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 41: Poster: Quantum Sensing

FM 41.3: Poster

Tuesday, September 24, 2019, 16:30–18:30, Tents

Chip-based magnetic traps for superconducting levitation of µm-sized particles — •Martí Gutierrez Latorre, David Niepce, Matthias Rudolph, and Witlef Wieczorek — Quantum Technology Laboratory, Chalmers University of Technology, Gothenburg, Sweden

Levitated mechanical resonators are a unique platform capable of reaching unrivaled performance in quantum-enhanced sensing and, potentially, in realizing macroscopic quantum superposition states. This is enabled by their expected ultra-low coupling to the environment, resulting in ultra-high mechanical quality factors. Furthermore, the trapping frequency of such a levitated resonator can be increased by exploiting high magnetic field gradients achievable via miniaturization. As a first step, we develop chip-based traps and particles for superconducting magnetic levitation. We present FEM simulations of integrated trap architectures for levitation of µm-sized particles. The force, potential energy and magnetic field on the levitated particles are calculated, showing that trapping frequencies of a few hundreds of kHz are readily achievable and that the corresponding mechanical motion can be detected via pick-up coils connected to high-sensitivity SQUIDs. We further demonstrate the fabrication of such integrated magnetic traps and superconducting particles made of Nb on Si substrates via conventional micro-fabrication techniques. Our results pave the way to observing and sensing superconducting levitated µm-sized particles at 4K.