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Updated: Jun 12, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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A fiber-pigtailed quantum dot device generating indistinguishable photons at GHz clock-rates.

Lucas Rickert1, Kinga Żołnacz2, Daniel A Vajner1

  • 1Institute of Solid State Physics, Technical University Berlin, Hardenbergstraße 36, 10623 Berlin, Germany.

Nanophotonics (Berlin, Germany)
|June 5, 2025
PubMed
Summary
This summary is machine-generated.

We developed a plug-and-play quantum light source using fiber-pigtailed quantum dots (QDs) and hybrid circular Bragg gratings (hCBGs). This source emits indistinguishable photons at high clock rates, ideal for quantum information applications.

Keywords:
GHz operationfiber-couplingquantum dot devicesquantum light generation

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Area of Science:

  • Quantum Information Science
  • Nanophotonics
  • Solid-State Physics

Background:

  • Semiconductor quantum dots (QDs) are key for solid-state quantum light sources.
  • Efficient fiber coupling is crucial for practical quantum information applications outside lab settings.
  • Hybrid circular Bragg grating (hCBG) micro-cavities offer enhanced light-matter interaction.

Purpose of the Study:

  • To present a fiber-pigtailed, cavity-enhanced quantum light source for "plug-and-play" photonic quantum information.
  • To demonstrate high-performance single-photon emission with indistinguishability and high clock rates.
  • To validate the suitability of hCBG micro-cavities for robust quantum light sources.

Main Methods:

  • Deterministic fiber-pigtailing of optimized QD-hCBG micro-cavity devices.
  • Characterization of emission lifetime, multi-photon suppression (g(2)(0)), and photon indistinguishability.
  • Measurement of single-photon coupling efficiency into a single-mode fiber at high excitation clock rates.

Main Results:

  • Achieved emission lifetimes < 80 ps (Purcell factor ~9).
  • Demonstrated multi-photon suppression (g(2)(0) < 1%) and photon indistinguishability (>80%).
  • Measured 53% single-photon coupling efficiency, yielding 1.2 Mcps at 80 MHz excitation, with performance sustained above 1 GHz.

Conclusions:

  • Purcell-enhanced, fiber-pigtailed quantum light sources based on hCBG cavities are demonstrated.
  • These sources enable high-rate, indistinguishable single-photon generation suitable for practical quantum applications.
  • The developed technology represents a significant advancement for scalable photonic quantum information processing.