54 lines
2.6 KiB
Plaintext
54 lines
2.6 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/0.24/qiskit/circuit/quantumregister.py" signature="Qubit(register=None, index=None)" modifiers="class">
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Bases: [`Bit`](qiskit.circuit.Bit "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 the index of an old-style bit in the register that owns it.
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In modern Qiskit Terra (version 0.17+), bits are the fundamental object and registers are aliases to collections of bits. A bit can be in many registers depending on the circuit, so a single containing register is no longer a property of a bit. It is an error to access this attribute on bits that were not constructed as “owned” by a register.
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<Admonition title="Deprecated since version 0.17" type="danger">
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The property `qiskit.circuit.bit.Bit.index` is deprecated as of qiskit-terra 0.17. It will be removed no earlier than 3 months after the release date. Instead, use `find_bit()` to find all the containing registers within a circuit and the index of the bit within the circuit.
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</Admonition>
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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 the register of an old-style bit.
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In modern Qiskit Terra (version 0.17+), bits are the fundamental object and registers are aliases to collections of bits. A bit can be in many registers depending on the circuit, so a single containing register is no longer a property of a bit. It is an error to access this attribute on bits that were not constructed as “owned” by a register.
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<Admonition title="Deprecated since version 0.17" type="danger">
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The property `qiskit.circuit.bit.Bit.register` is deprecated as of qiskit-terra 0.17. It will be removed no earlier than 3 months after the release date. Instead, use `find_bit()` to find all the containing registers within a circuit and the index of the bit within the circuit.
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</Admonition>
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</Attribute>
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</Class>
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