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Near-Unity Indistinguishability Single Photon Source for Large-Scale Integrated Quantum Optics.

Łukasz Dusanowski1, Soon-Hong Kwon1,2, Christian Schneider1

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We developed an integrated single photon source using In(Ga)As/GaAs quantum dots. This device generates highly pure and indistinguishable photons on-chip, crucial for quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Optoelectronics
  • Semiconductor Nanostructures

Background:

  • Scalable quantum information processing relies on integrated single photon sources.
  • High coherence and indistinguishability of photons are critical for on-chip quantum applications.
  • Quantum dots offer a promising platform for generating single photons.

Purpose of the Study:

  • To develop and characterize an integrated triggered single photon source.
  • To achieve high single photon purity and indistinguishability for quantum optics.
  • To enable on-chip quantum simulation, computation, and networking.

Main Methods:

  • Utilizing In(Ga)As/GaAs quantum dots coupled to ridge waveguides.
  • Implementing a triggered resonance fluorescence scheme for photon generation.
  • Measuring single photon purity and indistinguishability using interferometric techniques.

Main Results:

  • Demonstrated a triggered single photon source with high linear polarization.
  • Achieved 99.1% (multimode) and 96.0% (single mode) single photon purity.
  • Obtained 97.5% (multimode) and 95.0% (single mode) photon indistinguishability.
  • Fulfilled stringent requirements for multi-interferometric quantum optics.

Conclusions:

  • The integrated single photon source is scalable for on-chip applications.
  • This work presents a viable pathway for linear optical quantum technologies.
  • The device is suitable for quantum simulation, computation, and quantum networks.