UCF conductance variance identity: det(A A^T) = sum_{|S|=m} det(A_S)^2 (Cauchy-Binet)

Universal Conductance Fluctuation (UCF) Cauchy-Binet framework. Setup: in the Landauer-Buettiker formalism for mesoscopic conductance G = (e^2/h) Tr(t t^dagger) where t is an m x n transmission amplitude matrix between m left leads and n…