4137 / Amperage (Ampere): Production of SET-Chip and Kryostat at the PTB in Braunschweig: EUROPA, DEUTSCHLAND, NIEDERSACHSEN, BRAUNSCHWEIG (BRAUNSCHWEIG, GERMANY), 23.11.2007: Fabrication of SET chips in clean room at Physikalisch-Technische Bundesanstalt PTB in Braunschweig, Germany. En route towards a redifinition of the ampere, SI base unit for current, by tying it to a fundamental constant, the charge of an electron, PTB researchers are engaged in elaboration of SET chips - single-electron tunneling - to transport and count electrons. Dr. Thomas Weimann dismounting a wafer with 25 chips from load lock of electron beam lithography system. Screen: submicrometer layout of single electron pump. ) - Marc Steinmetz / VISUM - Keywords: SET, Chip, Single, Electron, Tunneling, Reinraum, Quantenmechanik, Quantenphysik, horizontal, Germany, Physikalisch, Technische, Bundesanstalt, PTB, science, technology, physics, metrology, base, unit, international, system, of, units, SI, metrical, measure, lab, ampere, current, electricity, SET, chip, single, electron, tunnelin