Microwave resonator readout of an ensemble solid state spin sensor

US10962611B2 · kind B2 · utility

Assignee

• Massachusetts Institute of Technology · US

Inventors

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

Key dates

• Filing date: Aug 27, 2019
• Grant date: Mar 30, 2021
• Expiry date: Sep 3, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/345
• WIPO field: Measurement
• WIPO sector: Instruments

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.