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Back and forth transfer and coherent coupling in a cold Rydberg dipole gas
Marcel Mudrich1, Nassim Zahzam, Thibault Vogt
1Laboratoire Aimé Cotton, Campus d'Orsay Bât. 505, 91405 Orsay, France. mudrich@physik.uni-freiburg.de
Physical Review Letters
|December 31, 2005
Summary
We investigated energy transfer between cold cesium Rydberg atoms using spectroscopy. This revealed coherent interactions and two decoherence mechanisms: atom motion and excitation migration.
Area of Science:
- Atomic physics
- Quantum optics
- Spectroscopy
Background:
- Rydberg atoms exhibit strong dipole-dipole interactions.
- Energy transfer mechanisms in cold atomic ensembles are crucial for quantum technologies.
- Understanding decoherence is key to controlling quantum systems.
Purpose of the Study:
- To investigate resonant dipole-dipole energy transfer between cold cesium Rydberg atoms.
- To characterize the coherent dynamics of Rydberg excitation transfer.
- To identify and differentiate sources of decoherence in the atomic ensemble.
Main Methods:
- Time-resolved narrow-band deexcitation spectroscopy was employed.
- This technique allows efficient Rydberg excitation and high-resolution spectroscopy.
- Avoided level crossings were used to spectroscopically observe dipole-dipole interactions.
Main Results:
- Resonant dipole-dipole energy transfer was observed spectroscopically.
- Coherent energy transfer was confirmed through np + np <--> ns + (n + 1)s reactions.
- Two primary decoherence mechanisms were identified: dipole-dipole interaction-induced atom motion and s-Rydberg excitation migration among p-Rydberg atoms.
Conclusions:
- Time-resolved deexcitation spectroscopy is effective for studying Rydberg atom interactions.
- Coherent dipole-dipole energy transfer occurs in cold cesium Rydberg atoms.
- Atom motion and excitation migration are significant decoherence pathways in these systems.