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Related Experiment Video

Updated: Dec 30, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Diabolical points in coupled active cavities with quantum emitters.

Jingnan Yang1,2, Chenjiang Qian1,2, Xin Xie1,2

  • 11Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China.

Light, Science & Applications
|January 24, 2020
PubMed
Summary

Researchers achieved macroscopic control over light backscattering direction in microdisks by optimizing cavity size. This breakthrough enables new possibilities for quantum information processing using geometric phase in photonic networks.

Keywords:
Micro-opticsMicroresonators

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Area of Science:

  • Optics and Photonics
  • Quantum Information Science

Background:

  • Single microdisks with embedded active emitters exhibit limited control over cavity modes and backscattering.
  • Symmetric backscattering in microdisks restricts controllability.

Purpose of the Study:

  • To demonstrate macroscopic control of backscattering direction in microdisks.
  • To explore the formation of diabolical points in active optical structures.

Main Methods:

  • Optimizing microdisk cavity size to control backscattering direction.
  • Utilizing two strongly coupled microdisks to confirm backscattering signatures.
  • Comparing experimental results with theoretical calculations of diabolical points.

Main Results:

  • Macroscopic control of backscattering direction achieved by tuning microdisk cavity size.
  • Positive and negative backscattering directions confirmed in single microdisks.
  • Diabolical points observed at the resonance of coupled microdisks, matching theoretical predictions.

Conclusions:

  • Optimized microdisk cavity size offers macroscopic control over light backscattering.
  • Diabolical points in active optical structures are achievable.
  • This work provides a foundation for quantum information processing using geometric phase in quantum photonic networks.