Add PauliRotation gate for dense Pauli string exponentials#8170
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anshjaiswal12 wants to merge 3 commits into
Open
Add PauliRotation gate for dense Pauli string exponentials#8170anshjaiswal12 wants to merge 3 commits into
anshjaiswal12 wants to merge 3 commits into
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PauliSumExponential uses sparse PauliString and drops identity factors, so exp(i*theta*X⊗I) was incorrectly reduced to a single-qubit rotation. Introduce PauliRotation/PauliRotationGate using DensePauliString with U = cos(theta)I + i*sin(theta)P and unit tests for unitary, decomposition, repr, and parameter resolution. Closes quantumlib#6598
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Clarify identity-factor handling in _decompose_, expand PauliRotation docstring, fix copyright year, and document the unitary test helper.
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Summary
Adds
PauliRotation/PauliRotationGateusingDensePauliStringso identity factors are preserved (e.g.XIstays two-qubit).Implements
U = cos(θ)I + i sin(θ)Pand decomposes viaPauliStringPhasorwith explicitqubits.Closes #6598
Tests
pytest cirq/ops/pauli_rotation_test.py— 15 tests.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.