def circuit_to_dagdependency(circuit):
"""Build a ``DAGDependency`` object from a ``QuantumCircuit``.
Args:
circuit (QuantumCircuit): the input circuits.
Return:
DAGDependency: the DAG representing the input circuit as a dag dependency.
"""
dagdependency = DAGDependency()
dagdependency.name = circuit.name
dagdependency.metadata = circuit.metadata
dagdependency.add_qubits(circuit.qubits)
dagdependency.add_clbits(circuit.clbits)
for register in circuit.qregs:
dagdependency.add_qreg(register)
for register in circuit.cregs:
dagdependency.add_creg(register)
for instruction in circuit.data:
dagdependency.add_op_node(instruction.operation, instruction.qubits,
instruction.clbits)
dagdependency._add_successors()
dagdependency.calibrations = circuit.calibrations
return dagdependency
def dag_to_dagdependency(dag):
"""Build a ``DAGDependency`` object from a ``DAGCircuit``.
Args:
dag (DAGCircuit): the input dag.
Return:
DAGDependency: the DAG representing the input circuit as a dag dependency.
"""
dagdependency = DAGDependency()
dagdependency.name = dag.name
dagdependency.metadata = dag.metadata
dagdependency.add_qubits(dag.qubits)
dagdependency.add_clbits(dag.clbits)
for register in dag.qregs.values():
dagdependency.add_qreg(register)
for register in dag.cregs.values():
dagdependency.add_creg(register)
for node in dag.topological_op_nodes():
# Get arguments for classical control (if any)
inst = node.op.copy()
dagdependency.add_op_node(inst, node.qargs, node.cargs)
dagdependency._add_successors()
# copy metadata
dagdependency.global_phase = dag.global_phase
dagdependency.calibrations = dag.calibrations
return dagdependency
