The Quantum Measurement Division (QMD) at NIST plays a crucial role in maintaining the International System of Units (SI), the metric system. The division focuses on precise measurements of fundamental constants using quantum phenomena like the quantum Hall effect and Josephson effect. In 2019, NIST contributed to the redefinition of the SI, which shifted the system to be based on fundamental constants and quantum mechanics. This redefinition, particularly the change from the International Prototype of the Kilogram to a constant of nature, represents a major advancement in measurement standards. The QMD continues to support the development of quantum-based measurement standards to ensure the SI remains reliable and robust.
Source: https://www.nist.gov/pml/quantum-measurement
Keywords: Quantum, Standards, Measurement, Metrology, Constants
