Matter-wave decoherence due to a gas environment in an atom interferometer

Area of Science:

• Quantum physics
• Atom interferometry

Background:

• Decoherence is a critical challenge in quantum systems.
• Scattering of photons is a known source of decoherence in atom interferometers.
• Decoherence from background gas scattering in atom interferometers was not previously characterized.

Purpose of the Study:

• To observe and quantify decoherence from background gas scattering in a Mach-Zehnder atom interferometer.
• To develop and validate a unified theoretical framework for decoherence.
• To compare decoherence mechanisms caused by background gas and scattered photons.

Main Methods:

• Experimental observation of decoherence in a Mach-Zehnder atom interferometer.
• Comparison of experimental results with theoretical predictions.
• Systematic variation of background gas species and beam collimation.

Main Results:

• Decoherence due to background gas scattering was experimentally observed for the first time.
• A single theoretical model successfully describes decoherence from both gas particle and photon scattering.
• Experimental data align with the predictions of the unified theory across different conditions.

Conclusions:

• Background gas scattering is a significant source of decoherence in atom interferometers.
• The developed theory provides a comprehensive understanding of scattering-induced decoherence.
• This work offers insights for improving the coherence and precision of atom interferometers.