Single-Spin Magnetomechanics with Levitated Micromagnets

TL;DR

This paper introduces a novel mechanical transduction platform using levitated micro-magnets coupled to spin qubits, enabling advanced quantum interfacing, sensing, and testing of quantum mechanics at mesoscopic scales.

Contribution

It presents a new method for trapping micro-magnets with high quality factors and coupling them to spin qubits, advancing quantum control and measurement technologies.

Findings

Achieved three-dimensional trapping with quality factors around one million.

Demonstrated magnetic coupling between a levitated magnet and a nitrogen vacancy center.

Enabled potential applications in quantum networks and ultra-sensitive metrology.

Abstract

We demonstrate a new mechanical transduction platform for individual spin qubits. In our approach, single micro-magnets are trapped using a type-II superconductor in proximity of spin qubits, enabling direct magnetic coupling between the two systems. Controlling the distance between the magnet and the superconductor during cooldown, we demonstrate three dimensional trapping with quality factors around one million and kHz trapping frequencies. We further exploit the large magnetic moment to mass ratio of this mechanical oscillator to couple its motion to the spin degree of freedom of an individual nitrogen vacancy center in diamond. Our approach provides a new path towards interfacing individual spin qubits with mechanical motion for testing quantum mechanics with mesoscopic objects, realization of quantum networks, and ultra-sensitive metrology.