def test_inequality_id_and_swap(self):
g = Graph()
i1 = g.add_vertex(0, 0, 0)
i2 = g.add_vertex(0, 1, 0)
o1 = g.add_vertex(0, 0, 1)
o2 = g.add_vertex(0, 1, 1)
g.inputs = [i1, i2]
g.outputs = [o1, o2]
g2 = g.copy()
g.add_edges([(i1, o2), (i2, o1)])
g2.add_edges([(i1, o1), (i2, o2)])
id_id = tensorfy(g2)
swap = tensorfy(g)
self.assertFalse(compare_tensors(id_id, swap))
def test_three_cnots_is_swap(self):
g = Graph()
i1 = g.add_vertex(0, 0, 0)
i2 = g.add_vertex(0, 1, 0)
o1 = g.add_vertex(0, 0, 1)
o2 = g.add_vertex(0, 1, 1)
g.inputs = [i1, i2]
g.outputs = [o1, o2]
g.add_edges([(i1, o2), (i2, o1)])
swap = tensorfy(g)
c = Circuit(2)
c.add_gate("CNOT", 0, 1)
c.add_gate("CNOT", 1, 0)
c.add_gate("CNOT", 0, 1)
three_cnots = tensorfy(c.to_graph())
self.assertTrue(compare_tensors(swap, three_cnots))
