qcircuit

qcircuit-add

from qutip import *

q = QubitCircuit(3, reverse_states=False)
q.add_gate("TOFFOLI", controls=[0, 2], targets=[1])
q.add_gate("CNOT", targets=[1], controls=[0])
display("q",q.png)
q.add_gate("TOFFOLI", controls=[0, 2], targets=[1])
display("q  updated",q.png)

q2 = QubitCircuit(3, reverse_states=False)
q2.add_gate("TOFFOLI", controls=[0, 2], targets=[1])
q2.add_gate("TOFFOLI", controls=[0, 2], targets=[1])
display("q2",q2.png)
q2.add_gate("CNOT", targets=[1], controls=[0], index=[1])
display("q2 updated",q2.png)

U = gate_sequence_product(q.propagators())
U2 = gate_sequence_product(q2.propagators())
U==U2