The two prepared-state rows form an exact readout assignment matrix. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

The rows form an assignment matrix

The matrix rows are 9/10, 1/10 and 1/5, 4/5.

A=[9101101545]A=\begin{bmatrix}\frac{9}{10}&\frac{1}{10}\\\frac{1}{5}&\frac{4}{5}\end{bmatrix}
Assignment matrixEvery displayed probability is tied to calibration counts.assignment matrixread zeroread onetrue zero9/109 shots1/101 shotstrue one1/52 shots4/58 shots

Each calibration row has one probability budget

Each row sums to 1. The table is not freehand text; the render boundary recomputes the rows.

each row sum=1\text{each row sum}=1
Checked matrix rowsThe matrix cannot display a row that disagrees with counts.assignment matrixread zeroread onetrue zero9/109 shots1/101 shotstrue one1/52 shots4/58 shots