FA-91329 / Quantum circuit simulation / Member archive

T-count tests the quarter-turn class before the half-turn class · case 04

rz(pi/2), an S gate, is counted as a T gate.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Input a gate list. t and tdg count one T each; h, s, sdg, x, y, z, cx, cz, swap count one Clifford; ccx costs 7 T and 8 Clifford; ["rz", q, a] with a in units of pi reduced mod 2 is skipped if 0, Clifford if a multiple of 1/2, one T if an odd multiple of 1/4, else ["unsupported", index]; other names give ["unknown-gate", index]. Return {"t_count", "clifford_count"}.

Why this case matters

T-count is the dominant fault-tolerant cost metric; misclassifying rotations skews resource estimates.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: random t-count 13	`{"clifford_count": 1, "t_count": 3}`	`{"clifford_count": 2, "t_count": 2}`	Failed

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