Wiktionary
cryoelectronics
n. the study, design and manufacture of electronic components that function at low temperatures; especially those that employ superconductivity
Wikipedia
Cryoelectronics
Cryoelectronics or cryolectronics is the study of superconductivity under cryogenic conditions and its applications. It is not to be confused with cryotronics, the study of the production of superconductor materials.