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Coherent single-atom superradiance.

Junki Kim1, Daeho Yang1, Seung-Hoon Oh1

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Summary
This summary is machine-generated.

Researchers achieved cavity-mediated coherent single-atom superradiance by sending correlated single atoms through a cavity one by one. Enhanced collective photoemission, showing an N-squared dependence, was observed even with fewer than one atom in the cavity.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Cavity quantum electrodynamics

Background:

  • Superradiance is a quantum phenomenon involving cooperative photon emission from correlated atoms in macroscopic systems.
  • Controlled collective atom-field interactions are crucial for harnessing superradiance, often achieved by imprinting correlations within atomic ensembles.

Purpose of the Study:

  • To demonstrate cavity-mediated coherent single-atom superradiance.
  • To investigate cooperative photon emission from individual atoms interacting with pre-existing atoms within a cavity.
  • To establish a platform for phase-controlled atom-field interactions.

Main Methods:

  • Single atoms with predefined correlations were sequentially sent through a high-quality factor optical cavity.
  • Nanometer-precision position control and phase-aligned state manipulation of atoms were achieved using a nanohole-array aperture.
  • Cooperative emission was measured by observing photon emission synchronized with the intracavity atomic ensemble.

Main Results:

  • Cavity-mediated coherent single-atom superradiance was successfully demonstrated.
  • An enhanced collective photoemission with an N-squared dependence was observed, even when the average number of intracavity atoms was less than unity.
  • The results confirm cooperative emission from individual atoms interacting with a pre-established ensemble.

Conclusions:

  • The study presents a novel method for achieving superradiance using sequential single-atom injections into an optical cavity.
  • This work provides a robust platform for precise phase-controlled atom-field interactions.
  • The observed N-squared scaling highlights the potential for scalable quantum phenomena with individually controlled atoms.