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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
The Hanbury Brown-Twiss effect in a pulsed atom laser
A G Manning1, S S Hodgman, R G Dall
1ARC Centre of Excellence for Quantum-Atom Optics and Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia.
Optics Express
|October 14, 2010
Summary
Researchers used the Hanbury Brown-Twiss effect to compare atom sources. They found Bose-Einstein condensates resist decoherence, unlike thermal atoms, paving the way for new condensate studies.
Area of Science:
- Quantum optics
- Atomic physics
- Condensate science
Background:
- The Hanbury Brown-Twiss (HBT) effect traditionally measures photon correlations.
- Understanding atom correlations is crucial for quantum technologies.
- Distinguishing coherent from incoherent atom sources is experimentally challenging.
Purpose of the Study:
- To directly compare density correlations of pulsed atom lasers and thermal atom sources.
- To investigate decoherence in atom sources using the HBT effect.
- To establish a new, high-rate method for studying atom correlations.
Main Methods:
- Utilized the Hanbury Brown-Twiss effect with pulsed sources of metastable helium.
- Compared atom density correlations from a Bose-Einstein condensate (BEC) and an ultracold thermal source.
- Employed isotropic Radio Frequency (RF) outcoupling for atom extraction.
Main Results:
- Observed no decoherence for atoms outcoupled from a BEC.
- Detected characteristic 'bunching' in density correlations for thermal atoms, indicating incoherence.
- Achieved significantly increased data acquisition rates compared to prior methods.
Conclusions:
- Isotropic RF outcoupling from BECs preserves coherence.
- The HBT effect is a viable tool for characterizing atom source coherence.
- This method enables future studies on condensate dynamics, such as formation and decay.
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