diff --git a/src/qibo/backends/pytorch.py b/src/qibo/backends/pytorch.py
index 3df847c6b4..9bc1909a85 100644
--- a/src/qibo/backends/pytorch.py
+++ b/src/qibo/backends/pytorch.py
@@ -85,11 +85,9 @@ def cast(
         """
         if dtype is None:
             dtype = self.dtype
-        elif isinstance(dtype, self.np.dtype):
-            dtype = dtype
         elif isinstance(dtype, type):
             dtype = torch_dtype_dict[dtype.__name__]
-        else:
+        elif not isinstance(dtype, torch.dtype):
             dtype = torch_dtype_dict[str(dtype)]
 
         if isinstance(x, self.np.Tensor):
diff --git a/tests/test_gates_gates.py b/tests/test_gates_gates.py
index f2d5f1db67..77eda97cc0 100644
--- a/tests/test_gates_gates.py
+++ b/tests/test_gates_gates.py
@@ -436,9 +436,10 @@ def test_u3(backend, seed_state, seed_observable):
         backend.cast(np.transpose(np.conj(final_state_decompose)))
         @ observable
         @ final_state_decompose,
-        backend.cast(np.transpose(np.conj(target_state))) @ observable @ target_state,
+        backend.cast(np.transpose(np.conj(target_state)))
+        @ observable
+        @ backend.cast(target_state),
     )
-
     assert gates.U3(0, theta, phi, lam).qasm_label == "u3"
     assert not gates.U3(0, theta, phi, lam).clifford
     assert gates.U3(0, theta, phi, lam).unitary
@@ -527,7 +528,9 @@ def test_cy(backend, controlled_by, seed_state, seed_observable):
         backend.cast(np.transpose(np.conj(final_state_decompose)))
         @ observable
         @ final_state_decompose,
-        backend.cast(np.transpose(np.conj(target_state))) @ observable @ target_state,
+        backend.cast(np.transpose(np.conj(target_state)))
+        @ observable
+        @ backend.cast(target_state),
     )
 
     assert gates.CY(0, 1).qasm_label == "cy"
@@ -571,7 +574,9 @@ def test_cz(backend, controlled_by, seed_state, seed_observable):
         backend.cast(np.transpose(np.conj(final_state_decompose)))
         @ observable
         @ final_state_decompose,
-        backend.cast(np.transpose(np.conj(target_state))) @ observable @ target_state,
+        backend.cast(np.transpose(np.conj(target_state)))
+        @ observable
+        @ backend.cast(target_state),
     )
 
     assert gates.CZ(0, 1).qasm_label == "cz"
diff --git a/tests/test_measurements.py b/tests/test_measurements.py
index 07ba9d9631..51e5bae07b 100644
--- a/tests/test_measurements.py
+++ b/tests/test_measurements.py
@@ -76,8 +76,11 @@ def test_measurement_gate(backend, n, nshots):
 def test_multiple_qubit_measurement_gate(backend):
     c = models.Circuit(2)
     c.add(gates.X(0))
-    c.add(gates.M(0, 1))
+    measure = c.add(gates.M(0, 1))
     result = backend.execute_circuit(c, nshots=100)
+    print(result.frequencies())
+    print(result.probabilities())
+    # print(measure.samples())
     target_binary_samples = np.zeros((100, 2))
     target_binary_samples[:, 0] = 1
     assert_result(