FA-91003 / Quantum circuit simulation / Member archive

Tableau CNOT propagates Z forward instead of backward · case 03

A Z stabilizer on the target is not copied onto the control, so a Bell state reports +XX, +ZI instead of +XX, +ZZ.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Input [n, gates] with gates h, s, x, z (["g", q]) and cx (["cx", c, t]). Track the n stabilizer generators of |0...0> (initially Z on each qubit) under the Aaronson-Gottesman update rules and return them as signed strings such as "+XX", character q describing qubit q.

Why this case matters

Stabilizer simulators verify Clifford circuits and error-correction encoders; a phase-bit rule error yields wrong syndromes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: random clifford 7	`["+ZXI", "+IXI", "+IIZ"]`	`["+ZII", "+ZXI", "+IIZ"]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.