Why is the conductance quantized?

wdlang
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according to the Landauer formula, the conductance is proportional to the transmission probability.

But the transmission probability is not quantized generally

So why is the conductance quantized?
 
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UltrafastPED said:
Does this help: http://en.wikipedia.org/wiki/Conductance_quantum

Quantization of conductance only applies in special circumstances.

i now see.

So it is not as specular as magnetic quantization in superconductors
 
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