qiskit.converters.dag_to_circuit
dag_to_circuit(dag, copy_operations=True)
Build a QuantumCircuit object from a DAGCircuit.
Parameters
- dag (DAGCircuit) – the input dag.
- copy_operations (bool) – Deep copy the operation objects in the
DAGCircuitfor the outputQuantumCircuit. This should only be set toFalseif the inputDAGCircuitwill not be used anymore as the operations in the outputQuantumCircuitwill be shared instances and modifications to operations in theDAGCircuitwill be reflected in theQuantumCircuit(and vice versa).
Returns
the circuit representing the input dag.
Return type
Example
from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit
from qiskit.dagcircuit import DAGCircuit
from qiskit.converters import circuit_to_dag
from qiskit.circuit.library.standard_gates import CHGate, U2Gate, CXGate
from qiskit.converters import dag_to_circuit
q = QuantumRegister(3, 'q')
c = ClassicalRegister(3, 'c')
circ = QuantumCircuit(q, c)
circ.h(q[0])
circ.cx(q[0], q[1])
circ.measure(q[0], c[0])
circ.rz(0.5, q[1]).c_if(c, 2)
dag = circuit_to_dag(circ)
circuit = dag_to_circuit(dag)
circuit.draw('mpl')
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