The conductance quantum is a fundamental physical constant that represents the quantized unit of electrical conductance. It is denoted by \( G_0 \) and defined as: \[ G_0 = \frac{2e^2}{h} \] where: - \( e \) is the elementary charge, approximately \( 1.602 \times 10^{-19} \) coulombs, - \( h \) is Planck's constant, approximately \( 6.
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