Laser Written Diamond Optoelectronic Devices for use in Quantum Computing

ORAL

Abstract

The nitrogen-vacancy (NV) defect within a diamond lattice has been shown as a viable candidate for a quantum register. Using laser writing, these defect centres can be placed with high precision at any depth through a sample, without inducing significant damage to the surrounding lattice [1-3], to create deep solid state qubit arrays. These sites have shown coherence times of 700 µs, as long as the longest achieved for room-temperature spin-echo coherence measurements in non-12C enriched diamond [1]. Additionally, the technique can be used to create conductive graphitic tracks, which are the subject of current investigation for their potential to act as DC circuitry within the diamond. Configuring the wires such that NVs lie between ends of two wires may allow charge state transfer, bringing greater control of defects, and enable sites to be tuned precisely. It is hoped that, combining these aspects, a single diamond could hold many individually addressable qubits leading to a compact quantum processor.

[1] C.J. Stephen et al., arXiv:1807.03643 (2018)
[2] Y.-C. Chen et al., Nature Photonics 11, 77 (2017)
[3] Y.-C. Chen et al., arXiv:1807.04028 (2018)

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Presenters

  • Yashna Lekhai

    University of Warwick, Department of Physics, University of Warwick

Authors

  • Yashna Lekhai

    University of Warwick, Department of Physics, University of Warwick

  • Colin Stephen

    University of Warwick, Department of Physics, University of Warwick

  • Yu-Chen Chen

    Department of Materials, University of Oxford

  • Laiyi Weng

    University of Oxford, Department of Materials, University of Oxford

  • Paul Hill

    University of Strathclyde, Institute of Photonics, University of Strathclyde

  • Sam Johnson

    University of Oxford, Department of Materials, University of Oxford

  • Angelo Frangeskou

    Department of Physics, University of Warwick, Coventry, CV4 7AL, UK, University of Warwick, Department of Physics, University of Warwick

  • Phil Diggle

    University of Warwick, Department of Physics, University of Warwick

  • Michael Strain

    University of Strathclyde, Institute of Photonics, University of Strathclyde

  • Erdan Gu

    University of Strathclyde, Institute of Photonics, University of Strathclyde

  • Ben Green

    Department of Physics, University of Warwick, Coventry, CV4 7AL, UK, University of Warwick, Department of Physics, University of Warwick

  • Mark Newton

    University of Warwick, Department of Physics, University of Warwick

  • Jason M Smith

    University of Oxford, Department of Materials, University of Oxford

  • Patrick Salter

    University of Oxford, Department of Engineering, University of Oxford

  • Gavin Morley

    Department of Physics, University of Warwick, Coventry, CV4 7AL, UK, University of Warwick, Department of Physics, University of Warwick