Abstract: This disclosure relates to a magnetometer for measuring a magnetic field. The magnetometer comprises a solid state quantum system with at least two quantum spin states. A control signal generator sets the quantum system into a quantum state that accumulates a phase over time depending on the magnetic field. A detector measures a signal from the quantum system indicative of the accumulated phase at a measurement time after the setting of the quantum state. A processor determines a magnetic field measurement based on the signal measured by the detector. Importantly, the quantum system is mounted on a rotator that is configured to rotate the quantum system about a rotation axis that defines an angle with the direction of the magnetic field and at a rotation rate that modulates the magnetic field over the measurement time.

Abstract: A single crystal CVD diamond component comprising: a surface, wherein at least a portion of said surface is formed of as-grown growth face single crystal CVD diamond material which has not been polished or etched and which has a surface roughness Ra of no more than 100 nm; and a layer of NV? defects, said layer of NV? defects being disposed within 1 ?m of the surface, said layer of NV? defects having a thickness of no more than 500 nm, and said layer of NV? defects having a concentration of NV? defects of at least 105 NV?/cm2.

Abstract: This disclosure relates to a magnetometer for measuring a magnetic field. The magnetometer comprises a solid state quantum system with at least two quantum spin states. A control signal generator sets the quantum system into a quantum state that accumulates a phase over time depending on the magnetic field. A detector measures a signal from the quantum system indicative of the accumulated phase at a measurement time after the setting of the quantum state. A processor determines a magnetic field measurement based on the signal measured by the detector. Importantly, the quantum system is mounted on a rotator that is configured to rotate the quantum system about a rotation axis that defines an angle with the direction of the magnetic field and at a rotation rate that modulates the magnetic field over the measurement time.

Abstract: The present disclosure provides a method of forming a hermetically sealed enclosure that comprises a diamond material. The method comprises providing first and second enclosure components comprising the diamond material and having first and second recesses, respectively, at edge portions. At least one of the first and second enclosure components has a cavity. The enclosure components have respective contact surfaces at the first and second recesses and are shaped such that an outer channel is formed by the co-operation of the first and second recesses when the first and second enclosure components are contacted at the contact surfaces to form the enclosure. The method further comprises bonding a first type of material to at least surface portions of the first and second recesses of the first and second enclosure components, respectively.

Abstract: The present disclosure provides a method of forming a hermetically sealed enclosure that comprises a diamond material. The method comprises providing first and second enclosure components comprising the diamond material and having first and second recesses, respectively, at edge portions. At least one of the first and second enclosure components has a cavity. The enclosure components have respective contact surfaces at the first and second recesses and are shaped such that an outer channel is formed by the co-operation of the first and second recesses when the first and second enclosure components are contacted at the contact surfaces to form the enclosure. The method further comprises bonding a first type of material to at least surface portions of the first and second recesses of the first and second enclosure components, respectively.

Abstract: A synthetic diamond material comprising one or more spin defects having a full width half maximum intrinsic inhomogeneous zero phonon line width of no more than 100 MHz. The method for obtain such a material involves a multi-stage annealing process.

Abstract: A single crystal CVD diamond component comprising: a surface, wherein at least a portion of said surface is formed of as-grown growth face single crystal CVD diamond material which has not been polished or etched and which has a surface roughness Ra of no more than 100 nm; and a layer of NV? defects, said layer of NV? defects being disposed within 1 ?m of the surface, said layer of NV? defects having a thickness of no more than 500 nm, and said layer of NV? defects having a concentration of NV? defects of at least 105 NV?/cm2.

Abstract: A synthetic diamond material comprising one or more spin defects having a full width half maximum intrinsic inhomogeneous zero phonon line width of no more than 100 MHz. The method for obtain such a material involves a multi-stage annealing process.