公开(公告)号：WO2019108781A1

公开(公告)日：2019-06-06

申请号：PCT/US2018/063044

申请日：2018-11-29

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY ,  BARRY, John F. ,  BRAJE, Danielle A. ,  EISENACH, Erik R. ,  MCNALLY, Christopher Michael ,  O'KEEFFE, Michael F. ,  PHAM, Linh M.

Inventor： BARRY, John F. ,  BRAJE, Danielle A. ,  EISENACH, Erik R. ,  MCNALLY, Christopher Michael ,  O'KEEFFE, Michael F. ,  PHAM, Linh M.

IPC: G01N24/10 ,  G01N24/12 ,  G01R33/00 ,  G01R33/02 ,  G01R33/12 ,  G01R33/20

Abstract: Here we present a solid-state spin sensor with enhanced sensitivity. The enhanced sensitivity is achieved by increasing the T 2 * dephasing time of the color center defects within the solid-state spin sensor. The T 2 * dephasing time extension is achieved by mitigating dipolar coupling between paramagnetic defects within the solid-state spin sensor. The mitigation of the dipolar coupling is achieved by applying a magic-angle-spinning magnetic field to the color center defects. This field is generated by driving a magnetic field generator (e.g., Helmholtz coils) with phase-shifted sinusoidal waveforms from current source impedance-matched to the magnetic field generator. The waveforms may oscillate (and the field may rotate) at a frequency based on the precession period of the color center defects to reduce color center defect dephasing and further enhance measurement sensitivity.

公开(公告)号：WO2022019990A2

公开(公告)日：2022-01-27

申请号：PCT/US2021/031911

申请日：2021-05-12

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY ,  BARRY, John F. ,  IRION, Reed Anderson ,  KEDZIORA, Jessica ,  STEINECKER, Matthew ,  FREEMAN, Daniel K. ,  BRAJE, Danielle A.

Inventor： BARRY, John F. ,  IRION, Reed Anderson ,  KEDZIORA, Jessica ,  STEINECKER, Matthew ,  FREEMAN, Daniel K. ,  BRAJE, Danielle A.

IPC: G01R33/02 ,  G06F3/046 ,  H03B15/00 ,  G01R33/022 ,  G01R33/1284 ,  G01R33/24 ,  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/√Hz. The encoding of magnetic signals in frequency rather than amplitude relaxes or removes otherwise stringent requires on the digitizer.

公开(公告)号：WO2020046860A1

公开(公告)日：2020-03-05

申请号：PCT/US2019/048238

申请日：2019-08-27

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY ,  BARRY, John, F. ,  EISENACH, Erik, R. ,  O'KEEFFE, Michael, F. ,  MAJUMDER, Jonah, A. ,  PHAM, Linh, M. ,  CHUANG, Isaac ,  THOMPSON, Erik, M. ,  PANUSKI, Christopher, Louis ,  ZHANG, Xingyu ,  BRAJE, Danielle, A.

Inventor： BARRY, John, F. ,  EISENACH, Erik, R. ,  O'KEEFFE, Michael, F. ,  MAJUMDER, Jonah, A. ,  PHAM, Linh, M. ,  CHUANG, Isaac ,  THOMPSON, Erik, M. ,  PANUSKI, Christopher, Louis ,  ZHANG, Xingyu ,  BRAJE, Danielle, A.

IPC: G01R33/60 ,  G01N24/00 ,  G01N24/08 ,  G01R33/62 ,  G01N24/006 ,  G01N24/10 ,  G01R33/0017 ,  G01R33/032 ,  G01R33/1284 ,  G01R33/26 ,  G01R33/323 ,  G01R33/345

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.

公开(公告)号：WO2021236192A2

公开(公告)日：2021-11-25

申请号：PCT/US2021/019727

申请日：2021-02-25

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY ,  BARRY, John F. ,  KEDZIORA, Jessica ,  STEINECKER, Matthew ,  MOULTON, Peter ,  O'KEEFFE, Michael F. ,  SCHLOSS, Jennifer ,  EISENACH, Erik R. ,  MAJUMDER, Jonah A. ,  PHAM, Linh M. ,  BRAJE, Danielle A.

Inventor： BARRY, John F. ,  KEDZIORA, Jessica ,  STEINECKER, Matthew ,  MOULTON, Peter ,  O'KEEFFE, Michael F. ,  SCHLOSS, Jennifer ,  EISENACH, Erik R. ,  MAJUMDER, Jonah A. ,  PHAM, Linh M. ,  BRAJE, Danielle A.

IPC: G01R33/24 ,  G01R33/00 ,  G01R33/032 ,  G01R33/60 ,  G01R33/345 ,  G01R33/0041 ,  H01P1/18 ,  H01P3/06 ,  H01P5/18 ,  H01P7/10 ,  H03B5/18 ,  H03B5/1864

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/√Hz. In some implementations, the sensor is less than 1 mL in volume.