If we can get the energy of a very simple multiplier down from 1 picojoule—where it is right now—to about a femtojoule, we’ll be able to reach the energy efficiency we need to make the expectations for the coming decade. He likes to put that energy in terms of biology:
Bernd Hoefflinger: One femtojoule is 10 times lower than the firing energy of a synapse, be it cat or mouse or human.
July 09, 2012
Getting to one Femtojoule per calculation
IEEE Spectrum - A new book called Chips 2020 was edited by this retired electrical engineer named Bernd Hoefflinge. Many experts came together to write a whole bunch of chapters on interesting new technologies that could emerge by 2020.