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An overview of the fundamental concepts and principles related to superconductivity, including the meissner effect, the bcs theory, and the different types of superconductors. It also introduces the concept of josephson junctions, which are crucial for the operation of superconducting quantum interference devices (squids). The definition and characteristics of josephson junctions, as well as their important applications in various fields, such as quantum computing, magnetometry, and neuroscience. The content is technical and likely intended for a university-level audience with a background in physics or electrical engineering.
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