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Updated: May 10, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Feedback control of trapped coherent atomic ensembles.

T Vanderbruggen¹, R Kohlhaas, A Bertoldi

¹Laboratoire Charles Fabry, Institut d'Optique, CNRS, Université Paris-Sud, 2 avenue Augustin Fresnel, 91127 Palaiseau, France.

Physical Review Letters

|June 11, 2013

Summary

We developed a feedback control system using weak optical measurements and microwave manipulations to protect atomic ensembles from decoherence. This method enhances the stability of superposition states for applications like atomic sensors.

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Area of Science:

Quantum optics
Atomic physics
Quantum control

Background:

Coherent atomic ensembles are sensitive to collective noise, leading to decoherence.
Protecting quantum states is crucial for quantum technologies and precision measurements.

Purpose of the Study:

To demonstrate feedback control for maintaining the internal states of trapped atomic ensembles.
To protect superposition states against collective decoherence using a novel feedback scheme.

Main Methods:

Utilizing weak optical measurements with minimal backaction.
Implementing coherent microwave manipulations for state correction.
Analyzing feedback efficiency using a binary noise model and characterizing the probe's trade-offs.

Main Results:

Successfully controlled internal states of trapped coherent atomic ensembles.
Demonstrated protection of superposition states against collective noise.
Showcased correction of general collective noise types.

Conclusions:

The developed feedback scheme effectively combats decoherence in atomic ensembles.
This technique advances the operation of atomic interferometers beyond the Ramsey scheme.
The method paves the way for the development of more sensitive atomic sensors.