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)

*We acknowledge funding from the UK EPSRC (EP/M013243/1) and the Royal Society.

–

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