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Engineered quantum vacuum fluctuations into a single-photon emitter using a two-level system (2LS) coupled to a waveguide. This controlled vacuum radiation forms non-Gaussian cat states, approximating individual photons.

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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics

Background:

  • Heisenberg's uncertainty principle dictates a fluctuating quantum vacuum, not empty space.
  • Nonadiabatic Hamiltonian changes can convert vacuum fluctuations into detectable radiation.

Purpose of the Study:

  • To control and engineer quantum vacuum radiation.
  • To create a single-photon emitter from vacuum fluctuations.

Main Methods:

  • Utilizing a two-level system (2LS) ultrastrongly coupled to a finite-band waveguide.
  • Analyzing vacuum state and emission properties.
  • Employing matrix-product states and polaron Hamiltonian methods for dynamics.

Main Results:

  • Shaped vacuum radiation into a non-Gaussian superposition of even and odd cat states via 2LS nonlinearity.
  • Achieved photon emission approximating individual photons when 2LS frequency is within band gaps.
  • Characterized ground and bound states, confirming the photon picture.

Conclusions:

  • Demonstrated control over quantum vacuum radiation for single-photon generation.
  • Established a method to engineer non-Gaussian states from vacuum fluctuations.
  • Validated the approach through rigorous theoretical and numerical analyses.