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Related Experiment Video

Updated: Jan 20, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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A Spin-Photon Interface Using Charge-Tunable Quantum Dots Strongly Coupled to a Cavity.

Zhouchen Luo1, Shuo Sun1, Aziz Karasahin1

  • 1Department of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute , University of Maryland , College Park , Maryland 20742 , United States.

Nano Letters
|September 5, 2019
PubMed
Summary

Researchers developed a stable quantum dot spin-photon interface for quantum networks. Deterministic charging via a diode structure enables precise control over cavity reflectivity, crucial for quantum computing and networking applications.

Keywords:
Quantum dotscavity quantum electrodynamicssingle electron spinstrong light-matter interaction

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Last Updated: Jan 20, 2026

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Nanotechnology

Background:

  • Charged quantum dots are promising solid-state qubits for quantum networks.
  • Existing spin-photon interfaces suffer from unstable charge states due to random impurity charging, limiting reflectivity contrast.
  • A stable and controllable spin-photon interface is essential for advancing quantum technologies.

Purpose of the Study:

  • To demonstrate a robust spin-photon interface using deterministically charged quantum dots.
  • To achieve strong coupling between a quantum dot spin and a photonic crystal cavity.
  • To enable spin-dependent modulation of cavity reflectivity for quantum applications.

Main Methods:

  • Utilizing a diode structure for deterministic charging of quantum dots.
  • Integrating the actively charged quantum dot into a photonic crystal cavity.
  • Employing optical pumping for spin initialization and measuring spin-dependent cavity reflectivity.

Main Results:

  • Achieved strong coupling between the cavity mode and the negatively charged quantum dot state.
  • Demonstrated strong spin-dependent modulation of cavity reflectivity with a cooperativity of 12.
  • Established a stable and controllable spin-photon interface.

Conclusions:

  • Deterministic charging provides a stable platform for quantum dot spin-photon interfaces.
  • The demonstrated interface is vital for mediating spin entanglement and photon-photon interactions.
  • This work advances quantum networking and distributed quantum computing.