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Related Concept Videos

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Scalable integrated single-photon source.

Ravitej Uppu1, Freja T Pedersen2, Ying Wang2

  • 1Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark. ravitej.uppu@nbi.ku.dk lodahl@nbi.ku.dk.

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|December 10, 2020
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Summary
This summary is machine-generated.

We developed a deterministic single-photon source using quantum dots on a chip, achieving near-unity photon indistinguishability and high generation rates. This breakthrough enables scalable quantum networks and boson sampling for quantum advantage.

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Area of Science:

  • Quantum Information Science
  • Nanophotonics
  • Quantum Optics

Background:

  • Scalable quantum networks require on-demand sources of indistinguishable single photons.
  • Achieving high generation efficiency and indistinguishability is crucial for quantum information processing.
  • Noise and decoherence are significant challenges in developing such sources.

Purpose of the Study:

  • To realize a deterministic single-photon source with near-unity indistinguishability.
  • To demonstrate the scalability of the source for quantum information processing.
  • To benchmark the source's performance for boson sampling and quantum advantage.

Main Methods:

  • Utilizing a quantum dot embedded in an on-chip planar nanophotonic waveguide circuit.
  • Employing deterministic single-photon generation techniques.
  • Measuring photon indistinguishability and generation rate.

Main Results:

  • A deterministic single-photon source with near-unity indistinguishability was realized.
  • The source generated over 100 single photons in long strings without loss of mutual indistinguishability.
  • An on-chip generation rate of 122 million photons per second was achieved, with 84% source efficiency.

Conclusions:

  • The developed single-photon source meets critical benchmarks for scaling quantum operations.
  • The source's performance enables advancements in boson sampling and achieving quantum advantage.
  • This on-chip device is a key enabler for distributed quantum networks.