148 lines
3.6 KiB
Plaintext
148 lines
3.6 KiB
Plaintext
---
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title: C3SXGate
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description: API reference for qiskit.circuit.library.C3SXGate
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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.library.C3SXGate
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---
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# C3SXGate
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<Class id="qiskit.circuit.library.C3SXGate" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.22/qiskit/circuit/library/standard_gates/x.py" signature="C3SXGate(label=None, ctrl_state=None)" modifiers="class">
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Bases: [`qiskit.circuit.controlledgate.ControlledGate`](qiskit.circuit.ControlledGate "qiskit.circuit.controlledgate.ControlledGate")
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The 3-qubit controlled sqrt-X gate.
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This implementation is based on Page 17 of \[1].
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**References**
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\[1] Barenco et al., 1995. [https://arxiv.org/pdf/quant-ph/9503016.pdf](https://arxiv.org/pdf/quant-ph/9503016.pdf)
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Create a new 3-qubit controlled sqrt-X gate.
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**Parameters**
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* **label** (*str or None*) – An optional label for the gate \[Default: None]
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* **ctrl\_state** (*int or str or None*) – control state expressed as integer, string (e.g. ‘110’), or None. If None, use all 1s.
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## Attributes
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### condition\_bits
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<Attribute id="qiskit.circuit.library.C3SXGate.condition_bits">
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Get Clbits in condition.
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**Return type**
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`List`\[[`Clbit`](qiskit.circuit.Clbit "qiskit.circuit.classicalregister.Clbit")]
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</Attribute>
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### ctrl\_state
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<Attribute id="qiskit.circuit.library.C3SXGate.ctrl_state">
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Return the control state of the gate as a decimal integer.
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**Return type**
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`int`
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</Attribute>
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### decompositions
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<Attribute id="qiskit.circuit.library.C3SXGate.decompositions">
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Get the decompositions of the instruction from the SessionEquivalenceLibrary.
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</Attribute>
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### definition
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<Attribute id="qiskit.circuit.library.C3SXGate.definition">
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Return definition in terms of other basic gates. If the gate has open controls, as determined from self.ctrl\_state, the returned definition is conjugated with X without changing the internal \_definition.
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**Return type**
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`List`
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</Attribute>
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### duration
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<Attribute id="qiskit.circuit.library.C3SXGate.duration">
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Get the duration.
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</Attribute>
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### label
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<Attribute id="qiskit.circuit.library.C3SXGate.label">
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Return instruction label
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**Return type**
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`str`
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</Attribute>
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### name
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<Attribute id="qiskit.circuit.library.C3SXGate.name">
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Get name of gate. If the gate has open controls the gate name will become:
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> \<original\_name\_o\<ctrl\_state>
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where \<original\_name> is the gate name for the default case of closed control qubits and \<ctrl\_state> is the integer value of the control state for the gate.
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**Return type**
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`str`
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</Attribute>
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### num\_clbits
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<Attribute id="qiskit.circuit.library.C3SXGate.num_clbits">
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Return the number of clbits.
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</Attribute>
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### num\_ctrl\_qubits
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<Attribute id="qiskit.circuit.library.C3SXGate.num_ctrl_qubits">
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Get number of control qubits.
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**Returns**
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The number of control qubits for the gate.
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**Return type**
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int
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</Attribute>
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### num\_qubits
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<Attribute id="qiskit.circuit.library.C3SXGate.num_qubits">
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Return the number of qubits.
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</Attribute>
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### params
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<Attribute id="qiskit.circuit.library.C3SXGate.params">
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Get parameters from base\_gate.
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**Returns**
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List of gate parameters.
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**Return type**
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list
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**Raises**
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**CircuitError** – Controlled gate does not define a base gate
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</Attribute>
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### unit
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<Attribute id="qiskit.circuit.library.C3SXGate.unit">
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Get the time unit of duration.
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</Attribute>
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</Class>
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