Massachusetts Institute of Technology

Erik M Thompson

John Francis Barry

Danielle Ann Braje

Linh M Pham

Christopher Louis Panuski

Kerry Alexander Johnson

Michael F O'Keeffe

Erik R Eisenach

Isaac Chuang

Steven R Gillmer

Joseph P Racamato

Jonah A Majumder

James V Eshbaugh

Xingyu Zhang

Christopher J Galbraith

Robert Leslie

Idahosa A Osaretin

William Joseph Blackwell

Michael DiLiberto

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.

Chopped bias magnetic field solid-state spin sensor for low frequency measurements of physical quantities

A system may comprise a scanner assembly and a radiometer. The radiometer may comprise a W-Band and F-Band receiver and an intermediate frequency processor. The system may be rotatably mounted to a bus via the scanner assembly.

Radiometer systems and methods

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.

Microwave resonator readout of an ensemble solid state spin sensor

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Waltham, MA, United States of America

Erik M Thompson