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Related Concept Videos

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Mapping quantum state dynamics in spontaneous emission.

M Naghiloo1, N Foroozani1, D Tan1

  • 1Department of Physics, Washington University, St Louis, Missouri 63130, USA.

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Summary
This summary is machine-generated.

Detecting the wave nature of emitted radiation causes diffusive quantum dynamics in superconducting atoms, differing from quantum jumps. Continuous homodyne detection offers control over quantum state evolution.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Quantum information science

Background:

  • Quantum state evolution during radiative decay is detection-dependent.
  • Photodetection leads to quantum jumps, while wave detection implies different dynamics.

Purpose of the Study:

  • Investigate diffusive dynamics of a superconducting artificial atom under continuous homodyne detection.
  • Characterize the correlation between homodyne signals and emitter states.
  • Map the conditional back-action of homodyne measurements.

Main Methods:

  • Continuous homodyne detection of spontaneous emission.
  • Quantum state tomography.
  • Tracking diffusive quantum trajectories.

Main Results:

  • Observed diffusive dynamics distinct from quantum jump evolution.
  • Characterized selective stochastic excitation based on measurement basis.
  • Demonstrated correlation between homodyne signal and emitter state.

Conclusions:

  • Continuous field detection offers an alternative to photodetection for controlling quantum evolution.
  • Homodyne detection induces unique diffusive quantum trajectories.
  • Measurement basis choice influences quantum state dynamics and excitation.