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Continuous-variable multipartite entanglement in an integrated microcomb.

Xinyu Jia1,2, Chonghao Zhai1, Xuezhi Zhu3

  • 1State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, China.

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|February 19, 2025
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Summary
This summary is machine-generated.

Researchers created an eight-mode continuous-variable entanglement on an integrated photonic chip, a significant advancement for quantum technologies like computing and sensing.

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Area of Science:

  • Quantum Information Science
  • Integrated Photonics
  • Quantum Optics

Background:

  • Large-scale entangled states are vital for quantum computation, communication, and metrology.
  • Integrated quantum photonics offers a scalable platform for generating and manipulating quantum states.
  • Generating entanglement with discrete variables is difficult; continuous-variable approaches are more promising.

Purpose of the Study:

  • To deterministically generate continuous-variable multipartite entanglement on an integrated photonic chip.
  • To overcome limitations of previous demonstrations, which were restricted to two qumodes.
  • To showcase the potential of integrated photonics for advanced quantum technologies.

Main Methods:

  • Utilized an integrated optical chip to generate a quantum microcomb producing multimode squeezed-vacuum optical frequency combs.
  • Employed continuous-variable encoding in light quadratures for qumode generation and entanglement.
  • Verified inseparability and demonstrated supermode multipartite entanglement via violation of the van Loock-Furusawa criteria.

Main Results:

  • Achieved deterministic generation of an eight-mode continuous-variable entanglement on a chip.
  • Verified the inseparability of the eight-mode state.
  • Demonstrated supermode multipartite entanglement over hundreds of megahertz sideband frequencies.
  • Characterized multipartite entanglement structures, approximating expected cluster states.

Conclusions:

  • This work demonstrates the feasibility of generating large-scale multipartite entanglement on integrated photonic devices.
  • Highlights the potential of continuous-variable integrated photonics for quantum computing, networking, and sensing.
  • Paves the way for scalable quantum information processing using on-chip photonic platforms.