FA-91129 / Quantum circuit simulation / Member archive

Shot sampler writes qubit 0 as the leftmost character · case 04

An outcome on basis index 1 of two qubits is counted as "10" instead of "01".

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Input [n, weights, uniforms]; weights are nonnegative integers for basis indices 0..2**n-1 and uniforms are exact decimal or fraction strings in [0, 1). Each uniform u selects the first index i with u * total < cumulative weight through i. Return counts {bitstring: count} with qubit n-1 leftmost. Errors: "bad-length", "negative-weight", "no-support", ["bad-uniform", position].

Why this case matters

Deterministic replay of sampled shots makes simulator results reproducible; CDF boundary slips bias counts toward impossible outcomes.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: random shots 25	`{"110": 3}`	`{"011": 3}`	Failed

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