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Fix the matrix representation of CUGate in Rust (backport #13121) #13124

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Sep 10, 2024
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Fix the matrix representation of CUGate in Rust (backport #13121) #13124

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4 changes: 2 additions & 2 deletions crates/circuit/src/gate_matrix.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -387,12 +387,12 @@ pub fn cu_gate(theta: f64, phi: f64, lam: f64, gamma: f64) -> GateArray2Q {
C_ZERO,
c64(0., gamma).exp() * cos_theta,
C_ZERO,
c64(0., gamma + phi).exp() * (-1.) * sin_theta,
c64(0., gamma + lam).exp() * (-1.) * sin_theta,
],
[C_ZERO, C_ZERO, C_ONE, C_ZERO],
[
C_ZERO,
c64(0., gamma + lam).exp() * sin_theta,
c64(0., gamma + phi).exp() * sin_theta,
C_ZERO,
c64(0., gamma + phi + lam).exp() * cos_theta,
],
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9 changes: 9 additions & 0 deletions releasenotes/notes/fix-cu-rust-6464b6893ecca1b3.yaml
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@@ -0,0 +1,9 @@
---
fixes:
- |
Fixed the definition of the :class:`.CUGate` matrix in Rust-space.
While this was not noticable while handling the :class:`.CUGate` purely on
Python side, this had knock-on effects when transpiler passes were using the
Rust representation, such as could happen in :class:`.Consolidate2qBlocks`.
Fixed `#13118 <https://github.com/Qiskit/qiskit/issues/13118>`__.

4 changes: 2 additions & 2 deletions test/python/circuit/test_rust_equivalence.py
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Expand Up @@ -66,7 +66,7 @@ def test_definitions(self):
continue

with self.subTest(name=name):
params = [pi] * standard_gate._num_params()
params = [0.1 * (i + 1) for i in range(standard_gate._num_params())]
py_def = gate_class.base_class(*params).definition
rs_def = standard_gate._get_definition(params)
if py_def is None:
Expand Down Expand Up @@ -141,7 +141,7 @@ def test_matrix(self):
continue

with self.subTest(name=name):
params = [0.1] * standard_gate._num_params()
params = [0.1 * (i + 1) for i in range(standard_gate._num_params())]
py_def = gate_class.base_class(*params).to_matrix()
rs_def = standard_gate._to_matrix(params)
np.testing.assert_allclose(rs_def, py_def)
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