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Tracking Quantum Coherence in Polariton Condensates with Time-Resolved Tomography.
Carolin Lüders1, Matthias Pukrop2, Franziska Barkhausen2
1Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany.
Physical Review Letters
|March 31, 2023
Summary
Researchers developed new phase-space methods to monitor quantum coherence in polariton condensates, enhancing coherence times. This provides a direct measure of quantum coherence for quantum information processing applications.
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.
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