diff --git a/pyqtorch/hamiltonians/evolution.py b/pyqtorch/hamiltonians/evolution.py
index ead01cce..5fe1a70a 100644
--- a/pyqtorch/hamiltonians/evolution.py
+++ b/pyqtorch/hamiltonians/evolution.py
@@ -13,7 +13,8 @@
 from pyqtorch.apply import apply_operator
 from pyqtorch.circuit import Sequence
 from pyqtorch.embed import Embedding
-from pyqtorch.primitives import Parametric, Primitive
+from pyqtorch.primitives import Primitive
+from pyqtorch.quantum_operation import QuantumOperation
 from pyqtorch.utils import (
     ATOL,
     Operator,
@@ -25,7 +26,7 @@
 )
 
 BATCH_DIM = 2
-TGenerator = Union[Tensor, str, Primitive, Parametric, Sequence]
+TGenerator = Union[Tensor, str, QuantumOperation, Sequence]
 
 logger = getLogger(__name__)
 
@@ -170,7 +171,7 @@ def __init__(
             self.generator_type = GeneratorType.SYMBOL
             self.generator_symbol = generator
             generator = []
-        elif isinstance(generator, (Primitive, Parametric, Sequence)):
+        elif isinstance(generator, (QuantumOperation, Sequence)):
             if qubit_support is not None:
                 logger.warning(
                     "Taking support from generator and ignoring qubit_support input."