Superconductivity is a macroscopic quantum phenomenon. Two of its manifestations are flux quantization and Josephson tunneling, which are the basis of the Superconducting Quantum Interference Device (SQUID).

SQUIDs are exquisitely sensitive detectors of magnetic field and voltage, and find a broad range of applications. Clarke will explain superconductivity and SQUID and describe some of these applications, including their use in:

• a "dark matter" detector to search for the putative axion.
• MRI scans in extremely low fields (microTesla).

For more information about John Clarke and its research visit his web page

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