Doppler-Enhanced Quantum Magnetometry with thermal Rydberg atoms

TL;DR

This paper demonstrates how thermal Doppler shifts in room-temperature Rydberg atoms can be exploited to enhance quantum magnetometry, achieving significantly larger magnetic field sensitivity through a novel copropagating laser arrangement.

Contribution

It introduces a method to harness Doppler shifts in a copropagating setup to significantly improve magnetic field detection sensitivity using Rydberg atom EIT.

Findings

Order-of-magnitude larger spectral splitting with copropagating lasers.

Theoretical modeling confirms experimental results.

Potential for room-temperature quantum magnetometry applications.

Abstract

We report experimental measurements showing how one can combine quantum interference and thermal Doppler shifts at room temperature to detect weak magnetic fields. We pump ${}^{87}$Rb atoms to a highly-excited, Rydberg level using a probe and a coupling laser, leading to narrow transmission peaks of the probe due to destructive interference of transition amplitudes, known as Electromagnetically Induced Transparency (EIT). While it is customary in such setups to use counterpropagating lasers to minimize the effect of Doppler shifts, here we show, on the contrary, that one can harness Doppler shifts in a copropagating arrangement to produce an enhanced response to a magnetic field. In particular, we demonstrate an order-of-magnitude bigger splitting in the transmission spectrum as compared to the counterpropagating case. We explain and generalize our findings with theoretical modelling and simulations based on a Lindblad master equation. Our results pave the way to using quantum effects for magnetometry in readily deployable room-temperature platforms.