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Triggered Superradiance and Spin Inversion Storage in a Hybrid Quantum System.

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We investigated superradiant emission from spin ensembles coupled to superconducting cavities. Trigger pulses control emission timing and phase, while stored energy can amplify microwave pulses.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Superconducting circuits

Background:

  • Superradiance involves collective emission from quantum emitters.
  • Coupling spin ensembles to superconducting cavities enables novel quantum phenomena.
  • Controlling spin inversion dynamics is crucial for quantum technologies.

Purpose of the Study:

  • To investigate the superradiant emission dynamics of an inverted spin ensemble coupled to a superconducting cavity.
  • To explore the effects of detuning and trigger pulses on superradiance.
  • To examine the potential for microwave amplification using stored spin ensemble energy.

Main Methods:

  • Utilizing a superconducting cavity strongly coupled to an inverted spin ensemble.
  • Implementing fast spin inversion followed by detuning to store inversion.
  • Applying weak trigger pulses to initiate and control superradiant emission.
  • Analyzing the emission characteristics and amplification capabilities.

Main Results:

  • Demonstrated controlled superradiant emission with tunable timing and phase via trigger pulses.
  • Observed the disappearance of transverse spin components during detuning.
  • Showcased microwave amplification of pulses by the spin ensemble below the spontaneous superradiance threshold.
  • Characterized the dependence of superradiance on inversion levels and hold times.

Conclusions:

  • Superradiant emission from spin ensembles in superconducting cavities can be precisely controlled.
  • Stored energy in spin ensembles offers a pathway for microwave amplification.
  • This system provides a platform for exploring fundamental quantum dynamics and developing quantum devices.