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Area of Science:

  • Quantum Optics
  • Materials Science
  • Spectroscopy

Background:

  • Understanding non-equilibrium dynamics in materials is crucial for characterizing their response.
  • Spectroscopic methods using few-photon probes offer a way to study matter fluctuations.
  • Quantum optical state tomography provides tools to analyze light-matter interactions.

Purpose of the Study:

  • To implement and validate a novel technique for measuring ultrafast non-equilibrium dynamics in complex materials.
  • To overcome limitations of phase-stable configurations in spectroscopic measurements.
  • To enable robust reconstruction of phase-averaged optical observables.

Main Methods:

  • Development and application of ultrafast phase randomized tomography.
  • Integration of pump-probe experiments with quantum optical state tomography.
  • Utilizing time-resolved multimode heterodyne detection with phase-randomized ultrashort laser pulses.

Main Results:

  • Successfully measured the ultrafast non-equilibrium dynamics in complex materials.
  • Validated the methodology by measuring the coherent phonon response in alpha-quartz.
  • Tracked photon number distribution dynamics with ultrafast resolution, setting limits on non-classical phononic states.

Conclusions:

  • The developed methodology provides a robust pathway to access non-equilibrium quantum fluctuations.
  • This technique advances the study of quantum materials and their dynamics.
  • Sets an upper limit to non-classical features of phononic states in alpha-quartz.