39 lines
869 B
Plaintext
39 lines
869 B
Plaintext
---
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title: num_qubits
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description: API reference for qiskit.pulse.builder.num_qubits
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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.pulse.builder.num_qubits
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---
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# qiskit.pulse.builder.num\_qubits
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<Function id="qiskit.pulse.builder.num_qubits" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.23/qiskit/pulse/builder.py" signature="num_qubits()">
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Return number of qubits in the currently active backend.
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Examples:
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```python
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from qiskit import pulse
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from qiskit.providers.fake_provider import FakeOpenPulse2Q
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backend = FakeOpenPulse2Q()
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with pulse.build(backend):
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print(pulse.num_qubits())
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```
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```python
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2
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```
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<Admonition title="Note" type="note">
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Requires the active builder context to have a backend set.
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</Admonition>
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**Return type**
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`int`
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</Function>
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