An all-optical intrinsic atomic gradiometer with sub-20 fT/cm/$\sqrt{\mathrm{Hz}}$ sensitivity in a 22 $\mu$T earth-scale magnetic field

A. R. Perry, M. D. Bulatowicz, M. Larsen +2

In this work we demonstrate a high sensitivity atomic gradiometer capable of operation in earth-field level environments. We apply a light-pulse sequence at four times the Larmor f…