High Sensitivity Magnetometry with a Fibre-coupled Diamond Sensor*

The negatively charged nitrogen-vacancy (NV) centre in diamond is one of the most studied solid-state defects because it has spin states that can be initialised and detected optically at room temperature [1]. A key technological development is the use of an ensemble of these defects for applications in high sensitivity magnetometry [2] which may lead to the development of medical devices for techniques such as magnetocardiography [3]. We present a fiber-coupled system which aims to detect the magnetic fields produced by electrical currents in the heart.

[1] M. Doherty, N. Manson, P. Delaney, F. Jelezko, J. Wrachtrup and L. Hollenberg, Phys. Rep., 528, 1 (2013).
[2] J. F. Barry, M. J. Turner, J. M. Schloss, D. R. Glenn, Y. Song, M. D. Lukin, H. Park, and R. L. Walsworth, PNAS, 113, 14133 (2016).
[3] M. W. Dale and G. W. Morley, arXiv:1705.01994 (2017).