def test_empty_dag(self):
""" Empty DAG has 0 number of tensor factors. """
circuit = QuantumCircuit()
dag = circuit_to_dag(circuit)
pass_ = NumTensorFactors()
_ = pass_.run(dag)
self.assertEqual(pass_.property_set['num_tensor_factors'], 0)
def test_depth_one(self):
""" A dag with operations in parallel (2 tensor factors)"""
qr = QuantumRegister(2)
circuit = QuantumCircuit(qr)
circuit.h(qr[0])
circuit.h(qr[1])
dag = circuit_to_dag(circuit)
pass_ = NumTensorFactors()
_ = pass_.run(dag)
self.assertEqual(pass_.property_set['num_tensor_factors'], 2)
def test_just_qubits(self):
""" A dag with 8 operations and 1 tensor factor."""
qr = QuantumRegister(2)
circuit = QuantumCircuit(qr)
circuit.h(qr[0])
circuit.h(qr[1])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[1], qr[0])
circuit.cx(qr[1], qr[0])
dag = circuit_to_dag(circuit)
pass_ = NumTensorFactors()
_ = pass_.run(dag)
self.assertEqual(pass_.property_set['num_tensor_factors'], 1)