Near-surface quantum sensing

Abstract

We consider a magnetic dipole near a planar conducting surface as a probe for sensing an external magnetic field. We analyze the Quantum Fisher Information (QFI) for estimating the magnetic field amplitude. We consider three specific settings for the magnetic dipole: (i) in free space; (ii) oriented parallel to a planar surface, and (iii) oriented perpendicular to the surface. We demonstrate that the QFI is enhanced when the magnetic dipole is perpendicular to the surface, relative to other scenarios.

Publication
Quantum Sensing, Imaging, and Precision Metrology III; 133920R. DOI:10.1117/12.3047680