20K is -253c conversion from K to C is quite simple just 273(.15) from C to K or subtract it from K to C :P<p>As far as temperature goes we don&#x27;t need room temperature we need it to be high enough to be able to get to those temperatures efficiently (e.g. phase cooling) which can then be applied easily to large scale computing systems.<p>With Optic-On-Chip&#x2F;PIC becoming a plausible reality it&#x27;s also might be possible to use laser based cooling within the silicon it self to get certain parts of it cold enough to introduce superconductivity but again every single degree (kelvin or otherwise) counts because the implications on the power required to cool the components down and keep them cool are enormous.<p>The problem with very low temperature and very small components isn&#x27;t even necessarily the energy if we are talking about the same component size and current and emerging silicon then with ~0-20K a stray high energy photon or any other type of cosmic radiation might be enough to knock your &quot;gates&quot; out of order if they are using some superconductive elements since we are already getting to the point of gates being atoms in size at least in some dimension.