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Gradient Echo Quantum Memory in Warm Atomic Vapor

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Published on: November 11, 2013

Electromagnetically induced transparency from a single atom in free space.

L Slodička¹, G Hétet, S Gerber

¹Institute for Experimental Physics, University of Innsbruck, A-6020 Innsbruck, Austria.

Physical Review Letters

|January 15, 2011

Summary

This summary is machine-generated.

Researchers observed electromagnetically induced transparency in a single trapped barium ion using absorption spectroscopy. This phenomenon significantly reduced probe beam extinction, demonstrating controlled light-matter interactions.

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Area of Science:

Atomic Physics
Quantum Optics
Spectroscopy

Background:

Electromagnetically induced transparency (EIT) is a quantum interference effect that modifies the optical properties of a medium.
Trapped ions are excellent systems for studying fundamental quantum phenomena due to their isolation and controllability.
Absorption spectroscopy is a technique used to measure the absorption of radiation as a function of frequency.

Purpose of the Study:

To experimentally observe and demonstrate electromagnetically induced transparency (EIT) in a single trapped ion.
To investigate the effect of a control laser on the absorption of a probe laser in a three-level atomic system.
To quantify the extinction of a probe beam due to EIT and population trapping.

Main Methods:

Utilizing absorption spectroscopy with a weak, narrow-band Gaussian light beam focused onto an optically cooled 138Ba+ ion.
Employing a high numerical aperture lens for precise focusing of the probe beam.
Tuning a strong control beam across a two-photon resonance in a three-level Lambda (Λ)-type system.

Main Results:

Observed significant extinction of the probe beam, reaching up to 1.35%.
Demonstrated electromagnetically induced transparency (EIT) by tuning the control beam.
Showed that probe beam extinction was inhibited by over 75% due to population trapping in the atomic system.

Conclusions:

Successfully demonstrated EIT in a single trapped 138Ba+ ion.
Highlighted the role of population trapping in inhibiting probe beam extinction.
Confirmed the potential of trapped ions for fundamental quantum optics studies.