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Gradient Echo Quantum Memory in Warm Atomic Vapor

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Published on: November 11, 2013

Wall-induced Ramsey effects on electromagnetically induced absorption.

Ho-Jung Kim¹, Han Seb Moon

¹Department of Radiology, Seoul National University College of Medicine, Yeongun-dong, Seoul, Korea.

|April 27, 2012

Summary

Ramsey interference in anti-relaxation coated cells causes spectral narrowing of electromagnetically induced absorption (EIA) due to long-lived atomic coherence. This calculated effect matches experimental results.

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Area of Science:

Atomic physics
Quantum optics
Laser spectroscopy

Background:

Electromagnetically induced absorption (EIA) is a quantum interference effect.
Atomic coherence in vapor cells is sensitive to wall interactions.
Anti-relaxation coatings minimize decoherence from wall collisions.

Purpose of the Study:

Investigate wall-induced Ramsey interference effects on EIA.
Analyze spectral narrowing in EIA resonance.
Explore the role of spontaneously transferred atomic coherence.

Main Methods:

Theoretical study of a four-level N-type atomic system.
Modeling Ramsey interference with decoherence-free wall collisions.
Calculation of EIA spectral lineshape.

Main Results:

Atomic coherence transferred to ground states interferes via Ramsey sequences.
Ramsey effect induces spectral narrowing of EIA resonance.
Calculated spectra align well with experimental narrow EIA spectra.

Conclusions:

Wall-induced Ramsey interference is a key mechanism for spectral narrowing in EIA.
Long lifetime of spontaneously transferred coherence contributes to the observed narrow lineshapes.
The study validates theoretical predictions against experimental observations in coated vapor cells.