>>> x = graph.pwc(durations=np.array([0.1, 0.3]), values=np.array([1, 2]))
>>> y = graph.pwc(durations=np.array([0.2, 0.2]), values=np.array([3, 1]))
>>> graph.pwc_sum([x, y], name="sum")
<Pwc: name="sum", operation_name="pwc_sum", value_shape=(), batch_shape=()>
>>> result = qctrl.functions.calculate_graph(graph=graph, output_node_names=["sum"])
>>> result.output["sum"]
[
{"value": 4.0, "duration": 0.1},
{"value": 5.0, "duration": 0.1},
{"value": 3.0, "duration": 0.2},
]