High-resolution magnetic field fingerprinting of integrated circuit activity with a quantum diamond microscope

A method comprising:

• directing a light beam from a coherent light source at a single crystal diamond, wherein the a single crystal diamond comprises a plurality of NV centers and is disposed adjacent to a magnetic field-generating article, wherein the single crystal diamond is configured generate a fluorescent signal in response to being illuminated;
• irradiating the single crystal diamond with a MW signal generated by a microwave (MW) radiation source;
• applying a bias magnetic field to the single crystal diamond by a magnetic field source;
• collecting the fluorescent signal generated by the single crystal diamond by a photosensor;
• sweeping, by a computing node operatively coupled to each of the coherent light source, the MW radiation source, the magnetic field source, and the photosensor, at least one control parameters selected from the group:
• the MW signal power, MW signal frequency, MW signal duration, and strength of the bias magnetic field, and
• based on the control parameters and the fluorescent signal generated by the single crystal diamond, computing, by the computing node, a magnetic vector field of the magnetic field-generating article.

A non-transitory computer-readable storage medium storing instructions that, when executed by a system comprising a computing node operatively coupled to each of a coherent light source, a microwave (MW) radiation source, and a magnetic field source, cause the system to:

• directing a light beam from the coherent light source at a single crystal diamond, wherein the a single crystal diamond comprises a plurality of NV centers and is disposed adjacent to a magnetic field-generating article, wherein the single crystal diamond is configured generate a fluorescent signal in response to being illuminated;
• irradiate the single crystal diamond with a MW signal generated by the MW radiation source;
• apply a bias magnetic field to the single crystal diamond by the magnetic field source;
• collect the fluorescent signal generated by the single crystal diamond by a photosensor;
• sweep at least one control parameters selected from the group:
• the MW signal power, MW signal frequency, MW signal duration, and strength of the bias magnetic field, and
• based on the control parameters and the fluorescent signal generated by the single crystal diamond, compute a magnetic vector field of the magnetic field-generating article.

A method comprising:

• receiving fluorescence data representing a fluorescent signal generated by a single crystal diamond comprising a plurality of NV centers and disposed adjacent a magnetic field-generating article;
• receiving parameter data representing one or more of a plurality of parameters, wherein the plurality of parameters characterize one or more selected from:
• a microwave signal irradiating the single crystal diamond, a bias magnetic field applied to the single crystal diamond, a light beam incident on the single crystal diamond, and a photosensor used to collect the fluorescent signal;
• and
• processing the received fluorescence data and the received parameter data to generate magnetic vector field data representing a magnetic vector field of the magnetic field-generating article.