Refactor Controlled Gate Tests for Non-Standard Control Values #7321
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…and mixed controls Implement various tests for the `controlled` method of gates like X, Z, CX, and CZ. These tests check the return type and unitary matrices for controlled gates with both zero and mixed control values. This ensures accurate behavior in quantum circuits when using controlled operations.
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This PR updates the tests related to the behavior of controlled gates when non-default control values (e.g.
[0]or mixed controls such as[1, 0]) are used. In issue #7241 it was noted that the methodsCXPowGate.controlled()andCZPowGate.controlled()exhibited inconsistent behavior when non-standard control values were applied, as they preserved a nestedControlledGatestructure rather than flattening the control layer with the specialized gate (e.g.CXPowGateorCZPowGate).To address this, the tests in
common_gates_test.pythat enforced a nested structure (by checking for instances ofControlledGateand comparinggate.sub_gateandcontrol_values) have been removed. The specialized gates are now expected to absorb the additional control logic, similar to what is done with default control values, ensuring consistency throughout the API.This change not only simplifies the API and related code (such as the special-case handling in
ControlledGate._decompose_), but also makes the behavior more intuitive when using non-standard control values.The commit includes:
• Removal of tests that asserted a nested controlled structure (e.g. those for
X.controlled(control_values=[0]),Z.controlled(control_values=[0]), and mixed control settings).After these changes, the unitary matrices of the controlled gates continue to be verified by the existing tests in the suite, ensuring that the overall functionality remains correct.
This refactoring paves the way for future work where the control logic is fully integrated into the specialized gate objects, contributing to a more consistent and understandable API behavior.
Closes #7241.
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