47 lines
2.0 KiB
Plaintext
47 lines
2.0 KiB
Plaintext
---
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title: circuit_to_dag
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description: API reference for qiskit.converters.circuit_to_dag
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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.circuit_to_dag
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---
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<span id="qiskit-converters-circuit-to-dag" />
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# qiskit.converters.circuit\_to\_dag
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<Function id="qiskit.converters.circuit_to_dag" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.24/qiskit/converters/circuit_to_dag.py" signature="circuit_to_dag(circuit, copy_operations=True)">
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Build a `DAGCircuit` object from a `QuantumCircuit`.
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**Parameters**
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* **circuit** ([*QuantumCircuit*](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit")) – the input circuit.
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* **copy\_operations** (*bool*) – Deep copy the operation objects in the [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit") for the output [`DAGCircuit`](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit"). This should only be set to `False` if the input [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit") will not be used anymore as the operations in the output [`DAGCircuit`](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit") 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 DAG representing the input circuit.
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**Return type**
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[DAGCircuit](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit")
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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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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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```
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</Function>
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