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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：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：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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