# Magnetic coherent population trapping in a single ion

## TL;DR

This paper demonstrates magnetic coherent population trapping in a single ion, using a double lambda scheme to precisely determine the null magnetic field point, with theoretical analysis revealing long-lived bright states.

## Contribution

It introduces a novel application of coherent population trapping in a single ion to measure magnetic null points with high precision.

## Key findings

- Magnetic CPT observed in a single ion.
- Null magnetic field point measured with shot noise limited precision.
- Theoretical analysis reveals long-lived bright states.

## Abstract

Magnetically induced coherent population trapping has been studied in a single trapped laser cooled ion. The magnetic field dependent narrow spectral feature is found to be an useful tool in determining the null point of magnetic field at the ion position. In particular, we use a double lambda scheme that allows us to measure the null magnetic field point limited by the detector shot noise. We analyzed the system theoretically and found certain long lived bright states as the dark state is generated under steady state condition.