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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Maintaining quantum coherence is crucial for quantum device engineering.
  • Quantifying complex decoherence mechanisms and achieving stable quantum systems remain significant challenges.

Purpose of the Study:

  • To develop novel phase-space methods for dynamically monitoring quantum coherence.
  • To enhance coherence times in polariton condensates.
  • To probe the potential of these systems for quantum information processing.

Main Methods:

  • Utilizing non-Gaussian convolutions of Glauber-Sudarshan quasiprobabilities.
  • Reconstructing phase-space functions from homodyne detection data (intensity- and time-resolved).
  • Developing compatible numerical simulation algorithms.

Main Results:

  • Demonstrated significantly enhanced coherence times in polariton condensates.
  • Probed quantum information processing capabilities up to the nanosecond regime.
  • Developed phase-space distributions directly sampleable from experimental data, including uncertainties.

Conclusions:

  • Introduced a broadly applicable framework for exploring time-dependent quantum phenomena.
  • Presented a platform for studying quantum resources with a simple operational measure of quantum coherence (variance in phase).
  • Validated experimental findings through numerical simulations.