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Related Experiment Videos

Collisional decoherence observed in matter wave interferometry.

Klaus Hornberger1, Stefan Uttenthaler, Björn Brezger

  • 1Universität Wien, Institut für Experimentalphysik, Boltzmanngasse 5, A-1090 Wien, Austria.

Physical Review Letters
|May 7, 2003
PubMed
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Quantum decoherence limits matter wave interferometry. Collisions with background gases suppress quantum interference in fullerene wave functions, revealing practical limits and vacuum needs for larger object interferometry.

Area of Science:

  • Quantum physics
  • Molecular interferometry
  • Decoherence studies

Background:

  • Quantum interference is crucial for matter wave interferometry.
  • Fullerenes are large molecules used in quantum experiments.
  • Collisions with background gases can cause decoherence, limiting quantum phenomena.

Purpose of the Study:

  • To investigate the loss of spatial coherence in fullerene wave functions.
  • To quantitatively support decoherence theory predictions.
  • To determine practical limits for matter wave interferometry at finite gas pressures.

Main Methods:

  • Studying the gradual suppression of quantum interference.
  • Analyzing the effect of increasing gas pressure on fullerene wave functions.

Related Experiment Videos

  • Quantitative comparison with decoherence theory predictions.

    • Main Results:

    • Observed gradual suppression of quantum interference with increasing gas pressure.
    • Quantitatively supported decoherence theory predictions.
    • Provided insights into the fullerene-gas interaction process.

    Conclusions:

    • Collisions with background gases lead to spatial decoherence in fullerene wave functions.
    • Finite gas pressures impose practical limits on matter wave interferometry.
    • Estimated experimental vacuum conditions necessary for interferometry with larger molecules.