Method for manufacturing a device comprising a diamond crystal

A method of manufacturing a device including a diamond crystal, a first laser radiation generator and a second magnetic field generator, the first generator being configured for illuminating a first face of the crystal with laser radiation, the second generator being configured for changing a value of a magnetic field in at least a portion of the crystal, the method including the steps of comprising:

• supply of supplying a substrate having a support face, a normal direction being defined, the normal direction being perpendicular to the support face, face;
• growth of growing a diamond crystal layer on the support face, the layer having a crystal lattice, the layer comprising at least a first set of XV centers in the crystal lattice, each XV center being composed of an X atom substituted for a carbon atom and coupled to a vacancy V, the XV center being a color center in the crystal lattice, each XV center having a quantification axis, the quantification axis connecting the substituted atom to the vacancy, a main direction being defined for the first set, the axes of quantification of the XV centers of the first set being parallel to the main direction of the set considered, the normal direction being distinct from the main direction of the first set;
• removing a first portion of the diamond layer in order to reveal the first face, the first face being perpendicular to the main direction of the first set;
• removing a second portion of the diamond layer in order to reveal a second face, the second face being perpendicular to the first face, and face;
• and
• positioning, with respect to the diamond crystal, the first generator in a first position and the second generator in a second position, the first generator being configured so that the laser radiation is perpendicular to the first face when the first generator is in the first position, the second generator being configured so that the magnetic field is parallel to the main direction when the second generator is in the second position.