If you want to measure resistance and you know Ohm’s law, it seems like you have an easy answer, right? Feed a known current through the thing you want to measure and read the voltage required.

Measuring resistance doesn’t seem to be a big deal. Put your meter leads across two wires or terminals and read the value, right? Most of the time that is good enough, but sometimes you need ...

Resistance measurement approach successfully observes topological signatures in multiterminal Josephson junctions by Ingrid Fadelli , Phys.org Credit: Wisne et al.

While this method of measuring conductance is fairly simple, to detect milliohm changes in resistance, the researchers first had to remove noise from the system.