def test_reverse(self):
"""
Reverse a quantum circuit
"""
qc = QubitCircuit(3)
qc.add_gate("RX", targets=[0], arg_value=3.141,
arg_label=r"\pi/2")
qc.add_gate("CNOT", targets=[1], controls=[0])
qc.add_measurement("M1", targets=[1])
qc.add_gate("SNOT", targets=[2])
# Keep input output same
qc.add_state("0", targets=[0])
qc.add_state("+", targets=[1], state_type="output")
qc.add_state("-", targets=[1])
qc_rev = qc.reverse_circuit()
assert qc_rev.gates[0].name == "SNOT"
assert qc_rev.gates[1].name == "M1"
assert qc_rev.gates[2].name == "CNOT"
assert qc_rev.gates[3].name == "RX"
assert qc_rev.input_states[0] == "0"
assert qc_rev.input_states[2] is None
assert qc_rev.output_states[1] == "+"
def test_add_state(self):
"""
Addition of input and output states to a circuit.
"""
qc = QubitCircuit(3)
qc.add_state("0", targets=[0])
qc.add_state("+", targets=[1], state_type="output")
qc.add_state("-", targets=[1])
assert qc.input_states[0] == "0"
assert qc.input_states[2] is None
assert qc.output_states[1] == "+"
qc1 = QubitCircuit(10)
qc1.add_state("0", targets=[2, 3, 5, 6])
qc1.add_state("+", targets=[1, 4, 9])
qc1.add_state("A", targets=[1, 4, 9], state_type="output")
qc1.add_state("A", targets=[1, 4, 9], state_type="output")
qc1.add_state("beta", targets=[0], state_type="output")
assert qc1.input_states[0] is None
assert qc1.input_states[2] == "0"
assert qc1.input_states[3] == "0"
assert qc1.input_states[6] == "0"
assert qc1.input_states[1] == "+"
assert qc1.input_states[4] == "+"
assert qc1.output_states[2] is None
assert qc1.output_states[1] == "A"
assert qc1.output_states[4] == "A"
assert qc1.output_states[9] == "A"
assert qc1.output_states[0] == "beta"
