53 lines
2.3 KiB
Plaintext
53 lines
2.3 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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<span id="qiskit-converters-dag-to-circuit" />
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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/0.24/qiskit/converters/dag_to_circuit.py" signature="dag_to_circuit(dag, copy_operations=True)">
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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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* **copy\_operations** (*bool*) – Deep copy the operation objects in the [`DAGCircuit`](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit") for the output [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit"). This should only be set to `False` if the input [`DAGCircuit`](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit") will not be used anymore as the operations in the output [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit") will be shared instances and modifications to operations in the [`DAGCircuit`](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit") will be reflected in the [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit") (and vice versa).
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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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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('mpl')
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```
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</Function>
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