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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Published on: March 30, 2017

Process tomography of dynamical decoupling in a dense cold atomic ensemble.

Yoav Sagi¹, Ido Almog, Nir Davidson

¹Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.

Physical Review Letters

|September 28, 2010

Summary

Researchers enhanced atomic memory coherence times by over 20-fold using dynamical decoupling on dense atomic ensembles. This advance enables longer quantum information storage with optically trapped Rubidium-87 atoms.

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Area of Science:

Quantum information science
Atomic physics
Quantum optics

Background:

Atomic ensembles offer collective enhancement for quantum operations.
High-density ensembles increase efficiency but suffer from decoherence due to collisions.

Purpose of the Study:

To investigate methods for extending coherence times in dense atomic ensembles.
To demonstrate the feasibility of using dense atomic ensembles as quantum memories.

Main Methods:

Experiments with optically trapped Rubidium-87 atoms.
Application of a dynamical decoupling sequence with over 200 pi pulses.
Utilizing quantum process tomography for characterization.

Main Results:

Achieved a 20-fold increase in coherence time.
Demonstrated coherence times exceeding 3 seconds.
Successfully utilized a dense ensemble (optical depth of 230) as an atomic memory.

Conclusions:

Dynamical decoupling significantly enhances coherence times in dense atomic ensembles.
Dense atomic ensembles can function as robust quantum memories with extended coherence.
This research paves the way for improved quantum information processing applications.