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Area of Science:

  • Quantum optics
  • Quantum information science
  • Photonics

Background:

  • Characterizing quantum systems is crucial for developing quantum technologies.
  • Understanding photon scattering provides insights into system dynamics and nonlinearities.
  • Existing methods may struggle with noise or simultaneous multi-segment analysis.

Purpose of the Study:

  • To develop an experimental procedure for interrogating quantum system scattering matrices.
  • To simultaneously obtain information on elastic and inelastic scattering segments.
  • To establish a noise-resilient method for quantum system characterization.

Main Methods:

  • Utilizing coherent state laser or microwave inputs.
  • Employing homodyne detection at the scatterer's output.
  • Combining experiments at various laser powers to minimize errors.

Main Results:

  • The procedure successfully interrogates single- and multiphoton scattering matrices.
  • Simultaneous information on multiple elastic and inelastic scattering segments is obtained.
  • The method demonstrates resilience to detector noise, with errors reducible by increasing laser power.

Conclusions:

  • The developed experimental procedure offers a robust way to characterize unknown quantum systems.
  • Pulsed lasers are essential for efficient tomography of scattering, particularly for nonlinear processes.
  • This work advances the toolkit for quantum system analysis and quantum information processing.