fix cu qiskit translation

tencent-quantum-lab · Dec 15, 2023 · fc2fb06 · fc2fb06
1 parent 9bd8721
commit fc2fb06
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -24,6 +24,8 @@
 
 - Support degenerate eigenvalue for jax backend `eigh` method when using AD
 
+- Fixed `cu` gate translation from qiskit to avoid qiskit bug
+
 ## 0.11.0
 
 ### Added

diff --git a/tensorcircuit/translation.py b/tensorcircuit/translation.py
@@ -523,7 +523,8 @@ def qiskit2tc(
                 tc_circuit.multicontrol(
                     *idx, ctrl=ctrl_state, unitary=gates._x_matrix, name="x"
                 )
-        elif gate_name[0] == "c" and gate_name[:7] != "circuit":
+        elif gate_name[0] == "c" and gate_name[:7] != "circuit" and gate_name != "cu":
+            # qiskit cu bug, see https://github.com/tencent-quantum-lab/tensorcircuit/issues/199
             for i in range(1, len(gate_name)):
                 if (gate_name[-i] == "o") & (gate_name[-i - 1] == "_"):
                     break

diff --git a/tests/test_circuit.py b/tests/test_circuit.py
@@ -1105,6 +1105,9 @@ def test_qiskit2tc():
     qisc.x(3)
     qisc.y(3)
     qisc.z(3)
+    qisc.cu(
+        5.868768495722669, 2.24809352294186, 3.59102783505607, 2.0223650288392, 1, 3
+    )
     qisc.cnot(0, 1)
     qisc.cy(0, 1)
     qisc.cz(0, 1, ctrl_state=0)