61 lines
1.9 KiB
Plaintext
61 lines
1.9 KiB
Plaintext
---
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title: dag_to_circuit
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description: API reference for qiskit.converters.dag_to_circuit
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in_page_toc_min_heading_level: 1
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python_api_type: function
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python_api_name: qiskit.converters.dag_to_circuit
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---
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# qiskit.converters.dag\_to\_circuit
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<Function id="qiskit.converters.dag_to_circuit" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.18/qiskit/converters/dag_to_circuit.py" signature="dag_to_circuit(dag)">
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Build a `QuantumCircuit` object from a `DAGCircuit`.
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**Parameters**
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**dag** ([*DAGCircuit*](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit")) – the input dag.
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**Returns**
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the circuit representing the input dag.
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**Return type**
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[QuantumCircuit](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit")
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**Example**
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```python
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from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit
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from qiskit.dagcircuit import DAGCircuit
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from qiskit.converters import circuit_to_dag
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from qiskit.circuit.library.standard_gates import CHGate, U2Gate, CXGate
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from qiskit.converters import dag_to_circuit
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%matplotlib inline
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q = QuantumRegister(3, 'q')
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c = ClassicalRegister(3, 'c')
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circ = QuantumCircuit(q, c)
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circ.h(q[0])
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circ.cx(q[0], q[1])
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circ.measure(q[0], c[0])
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circ.rz(0.5, q[1]).c_if(c, 2)
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dag = circuit_to_dag(circ)
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circuit = dag_to_circuit(dag)
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circuit.draw()
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```
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```python
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┌───┐ ┌─┐
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q_0: ┤ H ├──■──┤M├───────────
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└───┘┌─┴─┐└╥┘┌─────────┐
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q_1: ─────┤ X ├─╫─┤ Rz(0.5) ├
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└───┘ ║ └────╥────┘
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q_2: ───────────╫──────╫─────
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║ ┌──╨──┐
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c: 3/═══════════╩═══╡ = 2 ╞══
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0 └─────┘
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```
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</Function>
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