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Disorder-Induced Strongly Correlated Photons in Waveguide QED.

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Disorder in qubit transition frequencies can generate strongly correlated photons in waveguide arrays. This effect, leading to photon blockade, is crucial for advancing quantum technologies.

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Area of Science:

  • Quantum optics
  • Quantum information science
  • Solid-state physics

Background:

  • Strongly correlated photons are essential for quantum technologies.
  • Generating these photons typically requires specific conditions.

Purpose of the Study:

  • Investigate the generation of strongly correlated photons in a chain of N qubits coupled to a waveguide.
  • Explore the impact of disorder in transition frequencies on photon correlations.

Main Methods:

  • Theoretical investigation of N-qubit chains coupled to a 1D waveguide.
  • Analysis of photon transmission and reflection outputs.
  • Comparison between ordered and disordered systems.

Main Results:

  • Disorder in transition frequencies induces photon antibunching and photon blockade.
  • Nearly perfect photon blockade observed in transmission and reflection outputs.
  • Ordered chains show only weakly antibunched photons in reflection, none in transmission.

Conclusions:

  • Disorder-induced destructive interference enhances strongly correlated photon generation.
  • Disorder can be a key factor in achieving desired photon correlations.
  • This finding has implications for quantum technology development.