Sumida Corporation

Kyoto University

Kyocera Document Solutions Inc.

National Institute of Advanced Industrial Science and Technology

Japan Science and Technology Agency

Norikazu Mizuochi

Yoshiharu Yoshii

Kan Hayashi

Yuki Takemura

Masaki Saito

Toshiharu Makino

Satoshi Yamasaki

Hiromitsu Kato

Tsutomu Otsuka

Masateru Hashimoto

Shingo Hamada

Mutsuko Hatano

Takayuki Iwasaki

David Ernst Herbschleb

Tsutomu Ootsuka

Ernst David Herbschleb

A high-frequency magnetic field generatorapplies microwave to a magnetic resonance membercapable of an electron spin quantum operation using the microwave. A magnetapplies a static magnetic field to the magnetic resonance member. An irradiating deviceirradiates the magnetic resonance memberwith light of a specific wavelength. A flux transformersenses a measurement target magnetic field using a primary coiland applies an application magnetic field corresponding to the sensed measurement target magnetic field to the magnetic resonance memberusing a secondary coil. Further, the magnetic resonance memberis arranged at a position in a hollow part of the secondary coilof the flux transformerand in a hollow part of the magnet

Magnetic field measurement apparatus and magnetic field measurement method

A high-frequency magnetic field generating device includes two coils arranged with a predetermined gap in parallel with each other, the two coils (a) in between which electron spin resonance material is arranged or (b) arranged at one side from electron spin resonance material; a high-frequency power supply that generates microwave current that flows in the two coils; and a transmission line part connected to the two coils, that sets a current distribution so as to locate the two coils at positions other than a node of a stationary wave.

High-frequency magnetic field generating device

A magnetic resonance memberincludes a diamond crystal including plural diamond nitrogen vacancy center, and a high-frequency magnetic field generatorapplies magnetic field of microwave to the magnetic resonance member. The aforementioned plural diamond nitrogen vacancy centers include diamond nitrogen vacancy centers arranged in directions of predetermined plural axes among four axes that indicates four connection directions of carbon atoms in the diamond crystal; and the aforementioned magnetic resonance memberis arranged in a direction that provides a substantially largest sensitivity of the measurement target magnetic field in the diamond nitrogen vacancy centers arranged in the predetermined plural axes.

A substrateincludes a color center excited by excitation light, and at least a pair of reflection membersare arranged with gaps from the substrate. The substratecauses the excitation light entering the substrateto exit through its surfaces without reflection, and the reflection memberscause the exited excitation light to reflect at the reflection surface-or-and enter the substrate, and cause the excitation light to repeatedly enter and exit the substrateand thereby pass through the substrateonly a predetermined number of times. Here, the irradiating deviceemits the excitation light such that the excitation light is incident to the reflection surface-or-with an angle perpendicular to one axis among two axes of the reflection surface-or-and with a predetermined slant angle from the other axis.

Excitation light irradiating apparatus and excitation light irradiating method

In a measurement using a quantum sensor, the range of measurable physical quantities is increased while maintaining sensor sensitivity. A measuring device () comprises an irradiation unit () that irradiates a quantum sensor element () with electromagnetic waves for operating an electron spin state of the quantum sensor element () that changes due to interaction () with a measurement target (), in a pulse sequence in which a time τ between n/2 pulses is a variable value; and a physical quantity measuring unit () that calculates a physical quantity of the measurement target based on the electron spin state after the interaction with the measurement target ().

Measuring device and measuring method

A magnetic resonance memberincludes a crystal structure and is capable of electron spin quantum operations with microwaves of different frequencies corresponding to arrangement orientations of a vacancy and an impurity in a crystal lattice. A magnetic field transmission unitsenses a measurement target magnetic field at plural measurement positions different from each other, and applies application magnetic fields corresponding to the measurement target magnetic field sensed at the plural measurement positions to the magnetic resonance memberalong respective different directions corresponding to the aforementioned arrangement orientations. A measurement control unitcontrols a high frequency power supply, and determines detection values detected by a detecting device (an irradiating deviceand a light receiving device) of the physical phenomena corresponding to the plural measurement positions. A calculation unitcalculates the measurement target magnetic field at the plural measurement positions on the basis of the detection values.

The magnetic resonance memberis a member that is arranged in a measurement target AC physical field, and in which a quantum operation can be performed in a specific quantum system. The coiland the high frequency power supplyapply a magnetic field of a microwave to the magnetic resonance member. The irradiating deviceirradiates the magnetic resonance memberwith light, and the detecting devicedetects from the magnetic resonance membera physical phenomenon corresponding to the measurement target AC physical field. Further, the measurement control unitperforms the DC physical field measurement sequence a predetermined plural times, and in each of the plural times of the DC physical field measurement sequence, determines a detection value of the physical phenomenon detected by the detecting device. The calculation unitcalculates a measurement result for a specific time span of the measurement target AC physical field on the basis of the detection values corresponding to the plural times of the DC physical field measurement sequence.

Measurement apparatus and measurement method

An ODMR member is arranged in a measurement target AC magnetic field. A coil applies a magnetic field of a microwave to the ODMR member. A high frequency power supply causes the coil to conduct a current of the microwave. An irradiating device irradiates the ODMR member with light. A light receiving device detects light that the ODMR member emits. A measurement control unit performs a predetermined DC magnetic field measurement sequence at a predetermined phase of the measurement target AC magnetic field, and in the DC magnetic field measurement sequence, controls the high frequency power supply and the irradiating device and thereby determines a detection light intensity of the light detected by the light receiving device. A magnetic field calculation unit calculates an intensity of the measurement target AC magnetic field on the basis of the predetermined phase and the detection light intensity.

A sensor element including a diamond in which nitrogen-vacancy centers in a diamond crystal structure stabilize in a negative charge state. By ensuring that the diamond of the sensor element is n-type phosphorus-doped and contains nitrogen-vacancy centers in the crystal structure, the probability that nitrogen-vacancy centers in the diamond lattice are in a neutral state decreases, and the nitrogen-vacancy centers stabilize in a negative charge state.

Sensor element, measuring device, method for manufacturing sensor element, electronic circuit element, and quantum information element

A diamond crystal according to the present invention has an NV region containing a complex (NV center) of nitrogen substituted with a carbon atom and a vacancy located adjacent to the nitrogen, on a surface or in the vicinity of the surface, wherein the NV region has a donor concentration equal to or higher than the concentration of the NV centers, or a crystal of the NV region is a {111} face or a face having an off-angle that is &#xb1;10 degrees or less against the {111} face, and a principal axis of the NV center is a &#x3c;111&#x3e; axis that is perpendicular to the {111} face. Such a diamond crystal enables almost 100% of the NV center to be a state (NV) of having a negative electric charge, and spin states of the NVcenters to be aligned in one direction.

Growing community of inventors

Kyoto, Japan

Norikazu Mizuochi