42 lines
1.1 KiB
Plaintext
42 lines
1.1 KiB
Plaintext
---
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title: Qubit
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description: API reference for qiskit.circuit.Qubit
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in_page_toc_min_heading_level: 1
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python_api_type: class
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python_api_name: qiskit.circuit.Qubit
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---
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# Qubit
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<Class id="qiskit.circuit.Qubit" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.18/qiskit/circuit/quantumregister.py" signature="Qubit(register=None, index=None)" modifiers="class">
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Bases: `qiskit.circuit.bit.Bit`
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Implement a quantum bit.
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Creates a qubit.
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**Parameters**
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* **register** ([*QuantumRegister*](qiskit.circuit.QuantumRegister "qiskit.circuit.QuantumRegister")) – Optional. A quantum register containing the bit.
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* **index** (*int*) – Optional. The index of the bit in its containing register.
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**Raises**
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**CircuitError** – if the provided register is not a valid [`QuantumRegister`](qiskit.circuit.QuantumRegister "qiskit.circuit.QuantumRegister")
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## Attributes
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### index
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<Attribute id="qiskit.circuit.Qubit.index">
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Get bit’s index.
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</Attribute>
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### register
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<Attribute id="qiskit.circuit.Qubit.register">
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Get bit’s register.
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</Attribute>
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</Class>
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