The conductance quantum is the quantized unit of conductance. It is defined by 
and equals 77.5 microsiemens, which corresponds to 12.9kΩ. The conductance quantum is often denoted as G0.
It appears when measuring the conductance of a quantum point contact.
The name conductance quantum is somewhat misleading, since it implies that there can only be conductances that are integer multiples of G0. This is not the case, instead conductance quantum means the conductance of one conductance channel, if the probability of an electron entering this channel being transmitted is unity. If this probability is not unity, there must be a correction for the particular conductance channel.
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