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Qubit entanglement between ring-resonator photon-pair sources on a silicon chip

Author

Listed:
  • J. W. Silverstone

    (Centre for Quantum Photonics, University of Bristol)

  • R. Santagati

    (Centre for Quantum Photonics, University of Bristol)

  • D. Bonneau

    (Centre for Quantum Photonics, University of Bristol)

  • M. J. Strain

    (Institute of Photonics, University of Strathclyde)

  • M. Sorel

    (School of Engineering, University of Glasgow)

  • J. L. O’Brien

    (Centre for Quantum Photonics, University of Bristol)

  • M. G. Thompson

    (Centre for Quantum Photonics, University of Bristol)

Abstract

Entanglement—one of the most delicate phenomena in nature—is an essential resource for quantum information applications. Scalable photonic quantum devices must generate and control qubit entanglement on-chip, where quantum information is naturally encoded in photon path. Here we report a silicon photonic chip that uses resonant-enhanced photon-pair sources, spectral demultiplexers and reconfigurable optics to generate a path-entangled two-qubit state and analyse its entanglement. We show that ring-resonator-based spontaneous four-wave mixing photon-pair sources can be made highly indistinguishable and that their spectral correlations are small. We use on-chip frequency demultiplexers and reconfigurable optics to perform both quantum state tomography and the strict Bell-CHSH test, both of which confirm a high level of on-chip entanglement. This work demonstrates the integration of high-performance components that will be essential for building quantum devices and systems to harness photonic entanglement on the large scale.

Suggested Citation

  • J. W. Silverstone & R. Santagati & D. Bonneau & M. J. Strain & M. Sorel & J. L. O’Brien & M. G. Thompson, 2015. "Qubit entanglement between ring-resonator photon-pair sources on a silicon chip," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8948
    DOI: 10.1038/ncomms8948
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    Cited by:

    1. Marco Clementi & Federico Andrea Sabattoli & Massimo Borghi & Linda Gianini & Noemi Tagliavacche & Houssein El Dirani & Laurene Youssef & Nicola Bergamasco & Camille Petit-Etienne & Erwine Pargon & J., 2023. "Programmable frequency-bin quantum states in a nano-engineered silicon device," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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