Danielle A Braje

20210255258, Aug 19, 2021

Mar 1, 2021

17/188316

- Cambridge MA, US
Erik R. Eisenach - Cambridge MA, US
Michael F. O'Keeffe - Medford MA, US
Jonah A. Majumder - Cambridge MA, US
Linh M. Pham - Arlington MA, US
Isaac Chuang - Lexington MA, US
Erik M. Thompson - Waltham MA, US
Christopher Louis Panuski - Somerville MA, US
Xingyu Zhang - Cambridge MA, US
Danielle A. Braje - Winchester MA, US

G01R 33/12
G01R 33/32
G01R 33/26

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.

20210011098, Jan 14, 2021

Jul 6, 2020

16/946756

- Cambridge MA, US
Kerry Alexander Johnson - Somerville MA, US
Carson Arthur TEALE - Cambridge MA, US
Hannah A. CLEVENSON - Cambridge MA, US
Danielle Ann Braje - Winchester MA, US
Christopher Michael MCNALLY - Cambridge MA, US
John Francis BARRY - Cambridge MA, US

G01R 33/26
G01R 33/24
G01N 24/10
G01N 24/12
G01R 33/32

A magnetometer containing a crystal sensor with solid-state defects senses the magnitude and direction of a magnetic field. The solid-state defects in the crystal sensor absorb microwave and optical energy to transition between several energy states while emitting light intensity indicative of their spin states. The magnetic field alters the spin-state transitions of the solid-state defects by amounts depending on the solid-state defects' orientations with respect to the magnetic field. The optical read out, reporting the spin state of an ensemble of solid-state defects from one particular orientation class, can be used to lock microwave signals to the resonances associated with the spin-state transitions. The frequencies of the locked microwave signals can be used to reconstruct the magnetic field vector.

20200064419, Feb 27, 2020

Aug 27, 2019

16/551799

John F. Barry - Cambridge MA, US
Erik R. Eisenach - Cambridge MA, US
Michael F. O'Keeffe - Medford MA, US
Jonah A. Majumder - Cambridge MA, US
Linh M. Pham - Arlington MA, US
Isaac Chuang - Lexington MA, US
Erik M. Thompson - Waltham MA, US
Christopher Louis Panuski - Somerville MA, US
Xingyu Zhang - Cambridge MA, US
Danielle A. Braje - Winchester MA, US

G01R 33/12
G01R 33/26
G01R 33/32

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.

20200025835, Jan 23, 2020

Aug 21, 2018

16/106802

Linh M. Pham - Arlington MA, US
Erik M. Thompson - Waltham MA, US
John F. Barry - Cambridge MA, US
Kerry A. Johnson - Somerville MA, US
Danielle A. Braje - Winchester MA, US

G01R 33/00
G01R 33/26

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.

20190178958, Jun 13, 2019

Nov 29, 2018

16/204381

John F. Barry - Cambridge MA, US
Danielle A. Braje - Winchester MA, US
Erik R. Eisenach - Cambridge MA, US
Christopher Michael McNally - Cambridge MA, US
Michael F. O'Keeffe - Medford MA, US
Linh M. Pham - Arlington MA, US

G01R 33/26

Here we present a solid-state spin sensor with enhanced sensitivity. The enhanced sensitivity is achieved by increasing the T* dephasing time of the color center defects within the solid-state spin sensor. The T* 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.

20180136291, May 17, 2018

Nov 8, 2017

15/807269

Linh M. Pham - Arlington MA, US
Kerry Alexander Johnson - Somerville MA, US
Carson Arthur Teale - Cambridge MA, US
Hannah A. Clevenson - Cambridge MA, US
Danielle Ann Braje - Winchester MA, US
Christopher Michael McNally - Cambridge MA, US
John Francis Barry - Cambridge MA, US

G01R 33/26

A magnetometer containing a crystal sensor with solid-state defects senses the magnitude and direction of a magnetic field. The solid-state defects in the crystal sensor absorb microwave and optical energy to transition between several energy states while emitting light intensity indicative of their spin states. The magnetic field alters the spin-state transitions of the solid-state defects by amounts depending on the solid-state defects' orientations with respect to the magnetic field. The optical read out, reporting the spin state of an ensemble of solid-state defects from one particular orientation class, can be used to lock microwave signals to the resonances associated with the spin-state transitions. The frequencies of the locked microwave signals can be used to reconstruct the magnetic field vector.

20170370979, Dec 28, 2017

Jun 28, 2017

15/635852

Danielle Ann Braje - Winchester MA, US
Edward H. CHEN - Cambridge MA, US
Phillip R. HEMMER - College Station TX, US

G01R 29/08
G01R 33/32

Sensing the electric or strain field experienced by a sample containing a crystal host comprising of solid state defects under a zero-bias magnetic fields can yield a very sensitive measurement. Sensing is based on the spin states of the solid-state defects. Upon absorption of suitable microwave (and optical) radiation, the solid-state defects emit fluorescence associated with hyperfine transitions. The fluorescence is sensitive to electric and/or strain fields and is used to determine the magnitude and/or direction of the field of interest. The present apparatus is configured to control and modulate the assembly of individual components to maintain a zero-bias magnetic field, generate an Optically Detected Magnetic Resonance (ODMR) spectrum (with or without optical excitation) using appropriate microwave radiation, detect signals based on the hyperfine state transitions that are sensitive to electric/strain fields, and to quantify the magnitude and direction of the field of interest.