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qiskit.converters.dag_to_circuit

dag_to_circuit(dag)[source]

Build a QuantumCircuit object from a DAGCircuit.

Parameters

dag (DAGCircuit) – the input dag.

Returns

the circuit representing the input dag.

Return type

QuantumCircuit

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
%matplotlib inline

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()
     ┌───┐     ┌─┐           
q_0: ┤ H ├──■──┤M├───────────
     └───┘┌─┴─┐└╥┘┌─────────┐
q_1: ─────┤ X ├─╫─┤ RZ(0.5) ├
          └───┘ ║ └────┬────┘
q_2: ───────────╫──────┼─────
                ║   ┌──┴──┐  
c: 3/═══════════╩═══╡ = 2 ╞══
                0   └─────┘