def run(self, dag):
"""
Args:
dag(DAGCircuit): DAG circuit.
Returns:
DAGCircuit: optimized DAG circuit.
Raises:
TranspilerError: If the template has not the right form or
if the output circuit acts differently as the input circuit.
"""
circuit_dag = dag
circuit_dag_dep = dag_to_dagdependency(circuit_dag)
for template in self.template_list:
if not isinstance(template, QuantumCircuit):
raise TranspilerError('A template is a Quantumciruit().')
if template.num_qubits > len(circuit_dag_dep.qubits):
continue
identity = np.identity(2**template.num_qubits, dtype=complex)
try:
comparison = np.allclose(Operator(template).data, identity)
if not comparison:
raise TranspilerError(
'A template is a Quantumciruit() that '
'performs the identity.')
except TypeError:
pass
template_dag_dep = circuit_to_dagdependency(template)
template_m = TemplateMatching(circuit_dag_dep, template_dag_dep,
self.heuristics_qubits_param,
self.heuristics_backward_param)
template_m.run_template_matching()
matches = template_m.match_list
if matches:
maximal = MaximalMatches(matches)
maximal.run_maximal_matches()
max_matches = maximal.max_match_list
substitution = TemplateSubstitution(
max_matches, template_m.circuit_dag_dep,
template_m.template_dag_dep)
substitution.run_dag_opt()
circuit_dag_dep = substitution.dag_dep_optimized
else:
continue
circuit_dag = dagdependency_to_dag(circuit_dag_dep)
return circuit_dag
def test_metadata(self):
"""Test circuit metadata is preservered through conversion."""
meta_dict = dict(experiment_id="1234", execution_number=4)
qr = QuantumRegister(2)
circuit_in = QuantumCircuit(qr, metadata=meta_dict)
circuit_in.h(qr[0])
circuit_in.cx(qr[0], qr[1])
circuit_in.measure_all()
dag = circuit_to_dag(circuit_in)
self.assertEqual(dag.metadata, meta_dict)
dag_dependency = dag_to_dagdependency(dag)
self.assertEqual(dag_dependency.metadata, meta_dict)
dag_out = dagdependency_to_dag(dag_dependency)
self.assertEqual(dag_out.metadata, meta_dict)
def test_circuit_and_dag_dependency(self):
"""Check convert to dag dependency and back"""
qr = QuantumRegister(3)
cr = ClassicalRegister(3)
circuit_in = QuantumCircuit(qr, cr)
circuit_in.h(qr[0])
circuit_in.h(qr[1])
circuit_in.measure(qr[0], cr[0])
circuit_in.measure(qr[1], cr[1])
circuit_in.x(qr[0]).c_if(cr, 0x3)
circuit_in.measure(qr[0], cr[0])
circuit_in.measure(qr[1], cr[1])
circuit_in.measure(qr[2], cr[2])
dag_in = circuit_to_dag(circuit_in)
dag_dependency = dag_to_dagdependency(dag_in)
dag_out = dagdependency_to_dag(dag_dependency)
self.assertEqual(dag_out, dag_in)
def run(self, dag):
"""
Args:
dag(DAGCircuit): DAG circuit.
Returns:
DAGCircuit: optimized DAG circuit.
Raises:
TranspilerError: If the template has not the right form or
if the output circuit acts differently as the input circuit.
"""
circuit_dag = dag
circuit_dag_dep = dag_to_dagdependency(circuit_dag)
circuit = dagdependency_to_circuit(circuit_dag_dep)
operator_ini = Operator(circuit)
for template in self.template_list:
if not isinstance(template, QuantumCircuit):
raise TranspilerError('A template is a Quantumciruit().')
identity = np.identity(2**template.num_qubits, dtype=complex)
comparison = np.allclose(Operator(template).data, identity)
if not comparison:
raise TranspilerError(
'A template is a Quantumciruit() that performs the identity.'
)
if template.num_qubits > len(circuit_dag_dep.qubits):
raise TranspilerError(
'A template should have equal or less number of qubit'
' compared to the circuit.')
template_dag_dep = circuit_to_dagdependency(template)
template_m = TemplateMatching(circuit_dag_dep, template_dag_dep,
self.heuristics_qubits_param,
self.heuristics_backward_param)
template_m.run_template_matching()
matches = template_m.match_list
if matches:
maximal = MaximalMatches(matches)
maximal.run_maximal_matches()
max_matches = maximal.max_match_list
substitution = TemplateSubstitution(
max_matches, template_m.circuit_dag_dep,
template_m.template_dag_dep)
substitution.run_dag_opt()
circuit_dag_dep = substitution.dag_dep_optimized
circuit_intermediate = dagdependency_to_circuit(
circuit_dag_dep)
opertator_intermediate = Operator(circuit_intermediate)
if operator_ini != opertator_intermediate:
raise TranspilerError(
'A failure happened during the substitution.')
else:
continue
circuit_dag = dagdependency_to_dag(circuit_dag_dep)
return circuit_dag