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公开(公告)号：US11774520B2
公开(公告)日：2023-10-03
申请号：US17317983
申请日：2021-05-12
Applicant: Massachusetts Institute of Technology
Inventor： John F. Barry , Reed Anderson Irion , Jessica Kedziora , Matthew Steinecker , Daniel K. Freeman , Danielle A. Braje
CPC classification number: G01R33/02 , G06F3/046 , H03B15/006
Abstract: Ferrimagnetic oscillator magnetometers do not use lasers to stimulate fluorescence emission from defect centers in solid-state hosts (e.g., nitrogen vacancies in diamonds). Instead, in a ferrimagnetic oscillator magnetometer, the applied magnetic field shifts the resonance of entangled electronic spins in a ferrimagnetic crystal. These spins are entangled and can have an ensemble resonance linewidth of approximately 370 kHz to 10 MHz. The resonance shift produces microwave sidebands with amplitudes proportional to the magnetic field strength at frequencies proportional to the magnetic field oscillation frequency. These sidebands can be coherently averaged, digitized, and coherently processed, yielding magnetic field measurements with sensitivities possibly approaching the spin projection limit of 1 attotesla/√{square root over (Hz)}. The encoding of magnetic signals in frequency rather than amplitude relaxes or removes otherwise stringent requires on the digitizer.
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公开(公告)号：US20250051169A1
公开(公告)日：2025-02-13
申请号：US18796054
申请日：2024-08-06
Applicant: Massachusetts Institute of Technology
Inventor： Dane William De Quilettes , Eden C. Price , Justin Lee Mallek , Jennifer May Schloss , Danielle A. Braje
Abstract: Described herein is a diamond and diamond products comprising: a NV0 or SiV0 defect, wherein the NV0 or SiV0 defect comprises a nitrogen atom or silicon atom replacing a carbon atom in the diamond and a neutral vacancy replacing a carbon atom adjacent to the nitrogen atom or silicon atom in the diamond; a NV− or SiV− defect, wherein the NV− or SiV− defect comprises a nitrogen atom or silicon atom replacing a carbon atom in the diamond and a negatively-charged vacancy replacing a carbon atom adjacent to the nitrogen atom or silicon atom in the diamond; and a halide atom.
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Patent Agency Ranking
公开(公告)号：US12032044B2
公开(公告)日：2024-07-09
申请号：US17134589
申请日：2020-12-28
Applicant: Massachusetts Institute of Technology
Inventor： Danielle A. Braje , Jennifer Schloss , Linh M. Pham , John F. Barry , Erik R. Eisenach , Michael F. O'Keeffe , Jonah A. Majumder , Jessica Kedziora , Peter Moulton , Matthew Steinecker
Abstract: We have developed a high-performance, low-volume, low-weight, and low-power sensor based on a self-sustaining oscillator. The techniques described here may be used for sensing various fields; we demonstrate magnetic sensing. The oscillator is based on a dielectric resonator that contains paramagnetic defects and is connected to a sustaining amplifier in a feedback loop. The resonance frequency of the dielectric resonator shifts in response to changes in the magnetic field, resulting in a shift in the frequency of the self-sustaining oscillator. The value of the magnetic field is thereby encoded in the shift or modulation output of the self-sustaining oscillator. The sensor as demonstrated uses no optics, no input microwaves, and, not including digitization electronics, consumes less than 300 mW of power and exhibits a sensitivity at or below tens of pT/√{square root over (Hz)}. In some implementations, the sensor is less than 1 mL in volume.
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公开(公告)号：US20220011383A1
公开(公告)日：2022-01-13
申请号：US17317983
申请日：2021-05-12
Applicant: Massachusetts Institute of Technology
Inventor： John F. Barry , Reed Anderson Irion , Jessica Kedziora , Matthew Steinecker , Daniel K. Freeman , Danielle A. Braje
Abstract: Ferrimagnetic oscillator magnetometers do not use lasers to stimulate fluorescence emission from defect centers in solid-state hosts (e.g., nitrogen vacancies in diamonds). Instead, in a ferrimagnetic oscillator magnetometer, the applied magnetic field shifts the resonance of entangled electronic spins in a ferrimagnetic crystal. These spins are entangled and can have an ensemble resonance linewidth of approximately 370 kHz to 10 MHz. The resonance shift produces microwave sidebands with amplitudes proportional to the magnetic field strength at frequencies proportional to the magnetic field oscillation frequency. These sidebands can be coherently averaged, digitized, and coherently processed, yielding magnetic field measurements with sensitivities possibly approaching the spin projection limit of 1 attotesla/√{square root over (Hz)}. The encoding of magnetic signals in frequency rather than amplitude relaxes or removes otherwise stringent requires on the digitizer.
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公开(公告)号：US20210255258A1
公开(公告)日：2021-08-19
申请号：US17188316
申请日：2021-03-01
Applicant: Massachusetts Institute of Technology
Inventor： John F. Barry , Erik R. Eisenach , Michael F. O'Keeffe , Jonah A. Majumder , Linh M. Pham , Isaac Chuang , Erik M. Thompson , Christopher Louis Panuski , Xingyu Zhang , Danielle A. Braje
Abstract: Microwave resonator readout of the cavity-spin interaction between a spin defect center ensemble and a microwave resonator yields fidelities that are orders of magnitude higher than is possible with optical readouts. In microwave resonator readout, microwave photons probe a microwave resonator coupled to a spin defect center ensemble subjected to a physical parameter to be measured. The physical parameter shifts the spin defect centers' resonances, which in turn change the dispersion and/or absorption of the microwave resonator. The microwave photons probe these dispersion and/or absorption changes, yielding a measurement with higher visibility, lower shot noise, better sensitivity, and higher signal-to-noise ratio than a comparable fluorescence measurement. In addition, microwave resonator readout enables coherent averaging of spin defect center ensembles and is compatible with spin systems other than nitrogen vacancies in diamond.
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公开(公告)号：US11041916B2
公开(公告)日：2021-06-22
申请号：US16106802
申请日：2018-08-21
Applicant: Massachusetts Institute of Technology
Inventor： Linh M. Pham , Erik M. Thompson , John F. Barry , Kerry A. Johnson , Danielle A. Braje
Abstract: Applying a bias magnetic field to a solid-state spin sensor enables vector magnetic field measurements with the solid-state spin sensor. Unfortunately, if the bias magnetic field drifts slowly, it creates noise that confounds low-frequency field measurements. Fortunately, the undesired slow drift of the magnitude of the bias magnetic field can be removed, nullified, or cancelled by reversing the direction (polarity) of the bias magnetic field at known intervals. This makes the resulting solid-state spin sensor system suitable for detecting low-frequency (mHz, for example) changes in magnetic field or other physical parameters.
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公开(公告)号：US10962611B2
公开(公告)日：2021-03-30
申请号：US16551799
申请日：2019-08-27
Applicant: Massachusetts Institute of Technology
Inventor： John F. Barry , Erik R. Eisenach , Michael F. O'Keeffe , Jonah A. Majumder , Linh M. Pham , Isaac Chuang , Erik M. Thompson , Christopher Louis Panuski , Xingyu Zhang , Danielle A. Braje
Abstract: Microwave resonator readout of the cavity-spin interaction between a spin defect center ensemble and a microwave resonator yields fidelities that are orders of magnitude higher than is possible with optical readouts. In microwave resonator readout, microwave photons probe a microwave resonator coupled to a spin defect center ensemble subjected to a physical parameter to be measured. The physical parameter shifts the spin defect centers' resonances, which in turn change the dispersion and/or absorption of the microwave resonator. The microwave photons probe these dispersion and/or absorption changes, yielding a measurement with higher visibility, lower shot noise, better sensitivity, and higher signal-to-noise ratio than a comparable fluorescence measurement. In addition, microwave resonator readout enables coherent averaging of spin defect center ensembles and is compatible with spin systems other than nitrogen vacancies in diamond.
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