Detection Turns State Into Current

Conducting And Blocked Currents

the signal is a difference

The same voltage gives different ideal currents in two channel states. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Same voltage, different channel state

The conducting state carries 10 A; the blocked state carries 0 A.

Ion=10 A,Ioff=0 AI_{\text{on}}=10\ \text{A},\quad I_{\text{off}}=0\ \text{A}
Channel readoutA conducting state maps to current; a blocked state maps to zero.5 V1/2 ohm10 A

The readout contrast is the current difference

The ideal readout contrast is 10 A. Noise and stochastic gating are outside this detector model.

ΔI=10 A  −  0 A=10 A\Delta I=10\ \text{A}\;- \;0\ \text{A}=10\ \text{A}
Channel readoutA conducting state maps to current; a blocked state maps to zero.5 V1/2 ohm