Methods for quantum interference in atomic ensemble

TL;DR

This paper introduces a novel experimental technique for observing quantum interference in atomic ensembles using a bi-chromatic field and magnetic field scanning, simplifying calibration and enhancing magnetic field sensing capabilities.

Contribution

It presents a new method for quantum interference measurement in atomic ensembles that replaces frequency separation adjustments with magnetic field scanning.

Findings

Successful observation of quantum interference signals in Rubidium atoms.

The method allows simultaneous detection of population redistribution and superposition resonances.

The technique facilitates in-situ calibration of magnetic coils.

Abstract

An experimental method for obtaining quantum interference signal in atomic ensemble using a bi-chromatic field is discussed. Here, the quantum interference signal is obtained by scanning the magnetic field rather than conventional method of changing the frequency separation between the light fields. We could simultaneously observe resonances due to population redistribution and quantum superposition between non-degenerate states, which otherwise involves fundamentally different approaches. The method is implemented to Rubidium atoms in buffer gas filled as well as anti-relaxation coated atomic cells. Apart from phenomenological interest, the modified experimental procedure is found to be convenient for in-situ calibration of three axis magnetic coils. The investigation will be useful for high as well as low vector magnetic field sensing.