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Researchers created photonic graph states on a silicon chip using four photons. This demonstrates a scalable approach for future optical quantum computing and quantum information processing.

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Area of Science:

  • Quantum computing
  • Photonics
  • Quantum information science

Background:

  • Scalable architectures are crucial for future quantum computers.
  • Measurement-based protocols using graph states are state-of-the-art for optical quantum computing.
  • Silicon photonics offers a scalable technology with proven quantum optical functionality.

Purpose of the Study:

  • To produce and encode photonic graph states on a mass-manufactured silicon chip.
  • To demonstrate programmability in generating four-photon graph states.
  • To implement and test a basic measurement-based protocol using on-chip generated photons.

Main Methods:

  • Generating four photons on-chip using silicon photonics.
  • Programmably generating all types of four-photon graph states.
  • Implementing a measurement-based protocol and measuring heralded interference.
  • Developing a device model and using Bayesian inference to bound error sources.

Main Results:

  • Successful production and encoding of photonic graph states on a mass-manufactured chip.
  • Programmable generation of all four-photon graph state types.
  • High-visibility heralded interference measured from the chip's four photons.
  • Dominant error sources bounded using Bayesian inference.

Conclusions:

  • The combination of measurement-based quantum computation, silicon photonics, and on-chip multi-pair sources is promising for scalable quantum information processing.
  • This work represents a significant step towards building large-scale photonic quantum computers.
  • The developed methods pave the way for future advancements in quantum technologies.