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Fix pretty-printing of Clifford gates - #576
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thierry-martinez merged 5 commits intoAug 18, 2026
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This commit implements `clifford_to_str`, which relies on the QASM3 decomposition (into `I`, `X`, `Y`, `Z`, `S`, `S†`, and `H`), since it is more compact than the HSZ decomposition. `CLIFFORD_LABEL` is removed from `_db` as names were ambiguous. The QASM3 decomposition has been made optimal and is now tested. All members of the `Clifford` class now appear in the documentation and docstrings are fixed.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@## master #576 +/- ##
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Coverage 89.26% 89.27% =======================================
Files 49 49 Lines 7791 7798 +7 =======================================
+ Hits 6955 6962 +7
Misses 836 836 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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matulni
reviewed
Aug 12, 2026
Comment on lines
+158
to
+177
| def generate_qasm3_decomposition() -> tuple[tuple[str, ...], ...]: | ||
| decompositions: list[tuple[str, ...] | None] = [None] * len(Clifford) | ||
| new_decompositions: dict[Clifford, tuple[str, ...]] = { | ||
| clifford: (instr,) for clifford, instr in QASM3_BASIS.items() | ||
| } | ||
| while new_decompositions: | ||
| current_decompositions = new_decompositions | ||
| new_decompositions = {} | ||
| for clifford, decomposition in current_decompositions.items(): | ||
| decompositions[clifford.value] = decomposition | ||
| for clifford, decomposition in current_decompositions.items(): | ||
| for instr_clifford, instr in QASM3_BASIS.items(): | ||
| result = instr_clifford @ clifford | ||
| if decompositions[result.value] is not None: | ||
| continue | ||
| result_decomposition = (*decomposition, instr) | ||
| decompositions[result.value] = result_decomposition | ||
| new_decompositions[result] = result_decomposition | ||
| assert all(decomposition is not None for decomposition in decompositions) | ||
| return tuple(map(unwrap, decompositions)) |
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Seeing the code again, I realized that lines 167 and 174 are making the job twice. Fixed in 21590b2. Thanks for the compliment!
pranav97nair
approved these changes
Aug 18, 2026
pranav97nair
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Nice work, thanks Thierry!
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This commit implements
clifford_to_str, which relies on the QASM3 decomposition (intoI,X,Y,Z,S,S†, andH), since it is more compact than the HSZ decomposition.CLIFFORD_LABELis removed from_dbas names were ambiguous. The QASM3 decomposition has been made optimal and is now tested.All members of the
Cliffordclass now appear in the documentation and docstrings are fixed.