Canonical IR (u1q)

u1q is the canonical internal single-qubit IR used by the internal optimization engine.

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What u1q is for

• normalize single-qubit structure after public circuit intake
• support deterministic optimization passes
• keep backend lowering as a later explicit stage

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Boundary reminder

u1q is intentionally internal. Public callers should exchange circuits using the canonical external circuit IR (rqm-circuits).

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Relationship to pipeline

public circuit boundary -> internal optimization engine -> u1q canonicalization -> backend lowering

This separation preserves stable public contracts while enabling optimizer evolution.