8 results about "Spin system" patented technology

A method is provided for increasing a measurand, said measurand being associated with the exposure of probe spins to a sample magnetic field generated by precessing sample spins. The method comprises providing a solid comprising spin systems localized therein, said spin systems providing the probe spins, said probe spins having an average position. The method comprises providing a sample in a sample region, the sample comprising said sample spins, and said sample having a sample average position. The method comprises applying a static magnetic field to the sample region, the static magnetic field having a component being spatially homogeneous in the sample region, said component acting along a first direction, said static magnetic field causing the sample spins to precess. A distance between the sample average position and the average position of the probe spins does not exceed one millimeter, such that the probe spins are exposed to a sample magnetic field generated by the precessing sample spins. The method comprises, while the static magnetic field is being applied to the sample region: applying a pulsed magnetic field to the sample region, the pulsed magnetic field having a component along the first direction, wherein a gradient of said component of the pulsed magnetic field has a component perpendicular to at least one of the first direction and a relative sample position, wherein the relative sample position refers to a vector difference resulting from subtracting the average position of the probe spins from the sample average position. The method further comprises, while the static magnetic field is being applied to the sample region: measuring a measurand that is associated with occupations of quantum mechanical states of the probe spins. Said gradient has a magnitude, said magnitude referring to a time integral of said component of the gradient over a temporal period of the pulsed magnetic field. The method is characterized in that the magnitude is such that the measurand is increased by at least 25% over a reference measurement of the measurand, the reference measurement being performed like said measurement except for the applying of the pulsed magnetic field, wherein the pulsed magnetic field is not applied in the reference measurement.

This optimization method for retrieving a minimum energy state that provides the minimum energy of a spin system includes a step in which a computer retrieves the minimum energy of the spin system when the spin state of a spin included in the spin system is changed. In the retrieval step, the computer divides spins of the spin system into a plurality of spin groups on the basis of causal relationships between the spins, and retrieves the minimum energy of each spin group by changing the spin state of the spins included in the spin group and calculating the energy of the spin system.

The invention relates to the cross technical field of material science, computational physics and artificial intelligence, in particular to a method for calculating Curie temperature of a magnetic material based on a first principle and machine learning, which comprises the following steps of: training a machine learning model by using characteristics for describing an atomic chemical environment; predicting the magnetic moment of each atom in the multi-element alloy spin system at the target temperature based on the trained machine learning model; and the change relation of the magnetic susceptibility along with the temperature and the Curie temperature are obtained based on the magnetic moment of each atom in the multi-element alloy spin system at different target temperatures. According to the method, the relation between the complex chemical environment and the magnetic behavior can be learned and captured from a large amount of calculation data by combining a prediction method of machine learning. Compared with a traditional method, the method has more advantages when being used for treating a complex system, and can effectively cope with various variables and complex interactions existing in the multi-element alloy material.

The application discloses a current sensor based on a solid-state spin system. The current sensor comprises four-way probes and a data processing unit. Each way probe comprises a magnetic sensitive unit, a microwave unit, an optical unit, two optical detection units and a lock-in amplifier. The optical unit comprises a laser generator and a lens group for dividing the laser emitted by the laser generator into two optical paths of the main path and the reference path. The magnetic sensitive unit comprises a diamond sample containing NV color centers in four main axis directions. The microwave unit comprises a wave source, a radiation structure, a waveguide structure and a wave source control system. The two optical detection units respectively convert the optical signals on the reference path and the fluorescence into corresponding electrical signals for demodulation by the lock-in amplifier. The application realizes four-axis closed-loop measurement by modifying the microwave frequency, and the directions of the four axes are determined by the crystal direction of the diamond single crystal, so that the current sensor has better stability and orthogonality compared with a three-axis TMR magnetic sensor composed of three TMR magnetic sensors.

Disclosed herein are a sensor chip for parallel magnetic sensing of multiple samples, a system for parallel magnetic sensing of multiple samples, and a method for probing multiple samples using an optically addressable solid-state spin system. The sensor chip includes an optically transparent substrate with multiple optically addressable solid-state spin systems arranged in multiple sensing regions in a surface layer below a top surface of the substrate. The sensor chip further includes multiple sample sites, each sample site disposed above a respective sensing region. The sensor chip has a light guide system configured to provide an optical path through the substrate connecting each of the sensing regions.

The invention provides a magneto-optical pulse regulation and control-based SERF (single-electron radio frequency) gyroscope coupling spinning rapid overturning method, relates to the technical field of inertial navigation and quantum precision measurement, and adopts the magneto-optical pulse regulation and control-based SERF gyroscope coupling spinning rapid overturning method. Through cooperative control of rapid switching of a pi pulsed magnetic field and pumping light polarization driven by an electro-optical modulator (EOM) in the SERF atomic spin gyroscope, efficient and rapid overturning of a coupling spin system composed of alkali metal electron spin and inert gas nuclear spin in a self-compensation working state is realized. The method is suitable for periodic control of coupling spin polarization in a high-precision atomic spin gyroscope and suppression of system low-frequency drift errors.

A method for simulating the behavior of a physical system using a quantum computer comprising a plurality of qubits, wherein the qubits are first evaluated with respect to their system properties and categorized into high-performance qubits and low-performance qubits, wherein the physical system is described in a Hilbert space spanned by orbitals, and the spin-like system is assigned to the high-performance qubits during a mapping process, the behavior of the physical system is simulated using the qubits of the quantum computer, and physical observables of the physical system are determined by measurements of the qubits of the quantum computer, characterized in that, in an identification step, spin-like linear combinations of orbitals in the physical system are identified, and these are spin-like orbitals in the spin-like system.which, in addition to other remaining orbitals, span the Hilbert space, wherein the physical system thus described is transformed such that, after the transformation, changes in the number of electrons and / or the electron density on the spin-like orbitals are reduced or completely eliminated, and the transformed physical system is then described on a Hilbert space spanned only by the orbitals identified as spin-like.

The application relates to an electron and nuclear spin resonance method based on a non-uniform driving field. The electron and nuclear spin resonance method comprises the following steps: a plurality of groups of periodic driving fields are sequentially applied to a spin electron in an initial state; wherein the application phase angle of each group of periodic driving fields is alternately changed between the initial state of the spin electron and the orthogonal state of the initial state, the application time of each group of periodic driving fields is the same, and the change frequency of the application phase angle of the next group of periodic driving fields is different from that of the previous group of periodic driving fields; and the condition that the change frequency of the application phase angle of the driving field satisfies the formula (1) indicates that the electron and nuclear spins are in resonance. The method can realize the resonance coupling of the electron and nuclear spins, enhance the resonance coupling signal of the electron and nuclear spins, and be suitable for the electron and nuclear spin system under a strong magnetic field.