Survival Fraction Is A Count - Quantum Measurement and Coherence Windows Step by Step

The survival fraction is a count ratio, so the retained shots and prepared shots must be named before the fraction is trusted. The reduction is exact only for the stated integer counts and classification boundary; measured survival estimates carry binomial scatter, background subtraction choices, readout error, and timing uncertainty.

The survival fraction is computed from retained and prepared shots. 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 survival fraction is a count ratio

The retained fraction is retained over prepared: 60 over 80.

f_{\text{survive}}=60/80

The ratio reduces exactly

The checked fraction reduces to 3/4. No decimal lifetime curve is claimed.

f_{\text{survive}}=\frac{3}{4}