The third lecture in this series provides a summary of the primary realization of mass in the new SI and concludes with the relationship between the new Quantum SI and the field of quantum information science. Before describing how mass will be realized in the new SI, the lecture briefly reviews the problems with the current SI which includes mass and the fact that the quantum electrical standards are part of conventional units and not the SI. The lecture provides a very brief summary of how the kilogram will be realized using the X-ray crystal diffraction method and then provide a more detailed mise-en-pratique based on the NIST-4 watt balance as a primary realization. The lecture also provides an overview of future technologies for primary realization of small mass and force. The lecture then proceeds to look at the future of metrology by creating a connection between the Quantum SI and quantum information science. The new Quantum SI will allow us to test the Standard Model of physics and build sensors and technology good enough to provide high resolution gravity gradiometers, improved geodesy, and detectors that may detect dark matter. In concluding, the lecture returns to the value of embedded sensors and presents a view of the coming second quantum revolution.
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