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Colin J. Stephen

PDRA in the Warwick Diamond group working for the QCS Hub to produce high-quality diamond membranes with laser written NV- for cavity-enhanced qubits in diamond with Gavin Morley and Mark Newton.

Previous work has included studies of large three-dimensional arrays of laser-written NV- in diamond (below) and building a low-temperature confocal microscope for sensing with nanodiamonds.

Layers of a three dimensional array of laser written single NV- colour centres (pitch 3µm)


  1. [1] Y. C. Chen, P. S. Salter, S. Knauer, L. Weng, A. C. Frangeskou, C. J. Stephen, S. N. Ishmael, P. R. Dolan, S. Johnson, B. L. Green, G. W. Morley, M. E. Newton, J. G. Rarity, M. J. Booth, and J. M. Smith, “Laser writing of coherent colour centres in diamond”, Nat. Photonics 11, 77–80 (2016).

  2. [2] C. J. Stephen, B. L. Green, Y. N. D. Lekhai, L. Weng, P. Hill, S. Johnson, A. C. Frangeskou, P. L. Diggle, Y. C. Chen, M. J. Strain, E. Gu, M. E. Newton, J. M. Smith, P. S. Salter, and G. W. Morley, “Deep Three-Dimensional Solid-State Qubit Arrays with Long-Lived Spin Coherence”, Phys. Rev. Appl. 12, 064005 (2019).

  3. [3] Y. C. Chen, B. Griffiths, L. Weng, S. S. Nicley, S. N. Ishmael, Y. N. D. Lekhai, S. Johnson, C. J. Stephen, B. L. Green, G. W. Morley, M. E. Newton, M. J. Booth, P. S. Salter, and J. M. Smith, “Laser writing of individual nitrogen-vacancy defects in diamond with near-unity yield”, Optica 6, 662 (2019).