Abstract: A system and method for measuring acceleration. The system comprises a diamond having a nitrogen-vacancy centre configured to emit fluorescence under optical illumination in presence of a radio frequency field tuned to a resonant frequency of the nitrogen-vacancy centre, and a magnet, wherein a distance between the magnet and the diamond varies in response to acceleration of the system, the change in distance altering a magnetic field experienced by the diamond. The system also comprises an optical sensor, the optical sensor configured to sense variation in fluorescence emitted by the diamond in response to the altered magnetic field for measuring acceleration.

Abstract: The present invention provides a photon source comprising an optical waveguide and a material having at least one colour centre. The or each colour centre is arranged for photon emission and the material is grown so that the material is bonded to the optical waveguide and in use at least some of the photons emitted by the or each colour centre are guided in the optical waveguide. The present invention also provides a photon source having an optical waveguide incorporating the material which has the at least one colour centre.

Abstract: A method of fabricating a structure in a material.