Add PyZX-based ZX transformer to contrib (gh-6585)#8172
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Introduce cirq.contrib.zxtransformer with bidirectional Cirq↔PyZX conversion, full_reduce optimization, and support for measurements, resets, and classically controlled rotations. Based on the design from PR quantumlib#6647 and the author's cirq-zx-transformer reference implementation. Closes quantumlib#6585
Document the Cirq↔PyZX conversion pipeline, pyzx dependency, and supported optimization flow.
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Summary
Adds
cirq.contrib.zxtransformerwith bidirectional Cirq↔PyZX conversion,full_reduceoptimization, and support for measurements, resets, and classically controlled rotations. Based on PR #6647 and the author's reference implementation.Closes #6585
Tests
pytest cirq/contrib/zxtransformer/zxtransformer_test.py— 24 tests (requirespyzxinstalled).Tooling note
AI disclosure: Cursor IDE was used only to read/search the codebase and help debug the issue. All code in this PR was written and reviewed by me.