12 results about "Nitrogen-vacancy center" patented technology

The differential detection system (1) includes an optically trapping diamond nitrogen-vacancy doped layer (2) with an adjacent microwave resonator (4) having a resonant frequency with an operating bandwidth around the magnetic resonance of the nitrogen vacancy center. The microwave resonator (4) includes a suppressed portion (4B) and an unsuppressed portion (4A). A sensor photodiode (6A) is positioned distal to the doped layer (2) and aligned with the unsuppressed portion (4A) of the microwave resonator (4). A reference photodiode (6B) is spaced from the sensor photodiode (6A) and is substantially coplanar with the sensor photodiode (6A), while also aligned with the unsuppressed portion (4A) of the microwave resonator (4). The sensor (6A) and reference photodiode (6B) are connected back-to-back to a single transimpedance amplifier.

The present invention discloses a vector magnetic field probe and a vector magnetic field measurement method, which belong to the field of magnetic field measurement and include: a magnetic sensitive detector made of diamond containing nitrogen vacancy centers; a light guide module, the magnetic sensitive detector is fixed to the end of the light guide module, the light guide module is used to transmit an external laser of a preset wavelength to the magnetic sensitive detector, and to derive the fluorescence emitted by the magnetic sensitive detector; a magnetic field generator is used to apply a stable static magnetic field to the magnetic sensitive detector; a control field generator is used to apply a preset electromagnetic field to the magnetic sensitive detector; and a magnetic field amplifier, including three pairs of magnetic amplification units that are centrally symmetrical and whose central axes are perpendicular to each other, and the area enclosed by the plane where the minimum cross-section of each magnetic amplification unit is located is the magnetic amplification area; when working, the magnetic field amplifier is located in the vector magnetic field to be measured, and the magnetic sensitive detector is located in the magnetic amplification area. The present invention can simultaneously measure the magnitude and direction of the magnetic field and has high sensitivity to vector magnetic fields in any direction.

The invention refers to a quantum sensor device for measuring a magnetic field using fluorescence dependence on the magnetic field, the quantum sensor device (18) comprising a substrate made of single-crystal diamond, and nitrogen atoms in the substrate, the nitrogen atoms being partially present in the form of negatively charged nitrogen-vacancy (NV-) centres, wherein a ratio of the concentration of NV- centres to the concentration of the nitrogen atoms in the substrate is at most 14%.

A method for fast laser heating and cooling for nano / micro diamond is provided. The method includes performing laser irradiation and thermal dissipation on a reduced graphene oxide (rGO) sample. The rGO sample is dispersed on transmission electron microscopy (TEM) copper grids and nanodiamonds containing nitrogen-vacancy (NV) centers are dispersed on the rGO sample. The rGO sample is placed in a vacuum chamber and NV spins are polarized and read out by green laser. Further, the spin states of NV spins are manipulated by microwave. The polarizing and reading out are conducted at room temperature, while the manipulating spin states is conducted at high temperatures. The heating and cooling rates are significantly improved using reduced graphene oxide as the laser absorber and heat drain, enabling coherent quantum operation at temperatures up to 1400 Kelvin, surpassing the Curie temperatures of all known magnetic materials.

A planar spiral antenna resonator for fast manipulation of nuclear spin for qubit control in quantum computing and similar applications. The antenna exhibits wide bandwidth, and is configured with a central compact optical aperture for quantum sensing when coupled with a crystal lattice containing photo-luminescent defects, such as diamond with nitrogen-vacancy centers. The resonator features strong driving fields, with increased field-to-current ratios for rapid spin flips, exemplified by sub-microsecond proton quantum logic Pauli X-gate.

Provided is a method of estimating a magnetic field strength with a higher accuracy. The method of estimating a magnetic field strength includes detecting fluorescence emitted from diamond having nitrogen-vacancy centers with an external magnetic field applied thereto, by irradiating the diamond with excitation light and sweeping microwaves; removing, as noise, a long-periodic component having a value greater than a preset threshold from the detected fluorescence; fitting the fluorescence remaining after the removing of noise; and estimating a strength of the external magnetic field based on the fluorescence after the fitting.

Provided is a device based on ensemble nitrogen-vacancy centers, including: a right-angle prism; a dichroic parabolic condensing lens, a bottom opening oblique plane of the dichroic parabolic condensing lens is fixed on an oblique plane of the right-angle prism, and the dichroic parabolic condensing lens is configured to polarize the ensemble nitrogen-vacancy centers by an incident laser and collect a fluorescence signal at the ensemble nitrogen-vacancy center; a diamond, the diamond is a layered diamond, including a first face and a second face opposite to the first face, the first face is fixed at a top of a paraboloid of the dichroic parabolic condensing lens, and the second face includes the ensemble nitrogen-vacancy centers; a Lenz lens attached to the second face and configured to converge microwave magnetic field; a microwave coil located above the Lenz lens and configured to apply microwave magnetic field to the ensemble nitrogen-vacancy centers.

A quantum sensor element 10 has a diamond body 1 that includes nitrogen-vacancy centers in the crystal structure thereof. The diamond body 1 has: an optical waveguide region 2 that includes a nitrogen-vacancy center and extends in the thickness direction; and a boundary layer 3 that surrounds and demarcates an optical waveguide region 2 when viewed from the thickness direction. The optical waveguide region 2 has an optical emission end 2a at one end in the thickness direction. The boundary layer 3 reflects red light generated from the nitrogen-vacancy center within the optical waveguide region 2 and guides the red light to the optical emission end 2a.

The invention relates to a sensor unit for measuring a physical field, in particular a magnetic field, comprising: an NV quantum sensor, in particular an NV magnetometer, wherein the NV quantum sensor has a sensor medium and is configured to detect a field strength of the physical field at a measurement location by reading out a spin resonance in the sensor medium that depends on a field strength of the physical field, wherein the sensor medium has a diamond crystal or a section of a diamond crystal with nitrogen vacancy centers, wherein, with respect to a light field generated by the excitation light in the diamond crystal, the polarization of the excitation light in the diamond crystal is oriented substantially parallel to one of the four NV axes of the diamond crystal. The invention further relates to a method for measuring a physical field, a computer program, and a machine-readable storage medium.

Nanodiamond particles having a fluorescence emission peak derived from a nitrogen-vacancy (NV) center, the nanodiamond particles satisfying the following conditions (i) and (ii), (i) and (iii), or (i) and (ii) and (iii): (i) when a 1% by mass aqueous suspension of the particles is coated on a glass substrate, the particle has a fluorescence emission peak derived from the nitrogen-vacancy (NV) center; the proportion of the number of bright spots exhibiting an ODMR contrast of 7% or more among the bright spots of the ODMR in which the NV center is observed is 10% or more; (ii) the ODMR contrast is 0.12 or more; and (iii) the contrast in the Radar oscillation is 25% or more as the maximum value.

Highly integrated cantilever-based probe employing apparatus configured for scanning-type quantum sensing and imaging of nitrogen-vacancy centers. Optionally, the apparatus may utilize an atomic force microscope hardware. Method for fabricating and operating the same. The as-fabricated cantilever-based probe for use with such apparatus is structured to operate as a microwave antenna and lends itself for various magnetic field imaging, electric field imaging, and thermal imaging with high detection sensitivity and nano-scale spatial resolution.

A sensing system may include a microelectromechanical system (MEMS) device that may include a MEMS substrate having a resonator cavity formed therein, at least one MEMS resonator beam carried by the MEMS substrate within the resonator cavity, and a diamond layer carried by the substrate above the resonator cavity. The diamond layer may include at least one nitrogen vacancy center (NVC) aligned with the at least one MEMS resonator beam. A resonator drive circuit may be coupled to drive the at least one MEMS resonator beam. A sensing circuit may be associated with the at least one nitrogen vacancy center to infer small changes in a magnetic field acceleration from phase perturbations in local magnetic field resonance.