Cryotronics
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Cryotronics is the production of electronics that utilize superconductivity, and is not to be confused with cryoelectronics or cryolectronics. The simplest use of cryotronics is the cryotron, which is a switch. Rapid single flux quantum digital electronics technology is a good example of Cryotronics, as it is based on superconductors. Additionally, the sensitive amplifiers used in radio telescopes are cooled using liquid helium to reduce thermal noise.