113 lines
2.7 KiB
Plaintext
113 lines
2.7 KiB
Plaintext
---
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title: DCXGate
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description: API reference for qiskit.circuit.library.DCXGate
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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.DCXGate
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---
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# DCXGate
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<Class id="qiskit.circuit.library.DCXGate" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.21/qiskit/circuit/library/standard_gates/dcx.py" signature="DCXGate" modifiers="class">
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Bases: [`qiskit.circuit.gate.Gate`](qiskit.circuit.Gate "qiskit.circuit.gate.Gate")
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Double-CNOT gate.
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A 2-qubit Clifford gate consisting of two back-to-back CNOTs with alternate controls.
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Can be applied to a [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit") with the [`dcx()`](qiskit.circuit.QuantumCircuit#dcx "qiskit.circuit.QuantumCircuit.dcx") method.
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```python
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┌───┐
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q_0: ──■──┤ X ├
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┌─┴─┐└─┬─┘
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q_1: ┤ X ├──■──
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└───┘
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```
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This is a classical logic gate, equivalent to a CNOT-SWAP (CNS) sequence, and locally equivalent to an iSWAP.
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$$
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\begin{split}DCX\ q_0, q_1 =
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\begin{pmatrix}
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1 & 0 & 0 & 0 \\
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0 & 0 & 0 & 1 \\
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0 & 1 & 0 & 0 \\
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0 & 0 & 1 & 0
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\end{pmatrix}\end{split}
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$$
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Create new DCX gate.
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## Attributes
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### condition\_bits
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<Attribute id="qiskit.circuit.library.DCXGate.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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### decompositions
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<Attribute id="qiskit.circuit.library.DCXGate.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.DCXGate.definition">
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Return definition in terms of other basic gates.
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</Attribute>
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### duration
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<Attribute id="qiskit.circuit.library.DCXGate.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.DCXGate.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.DCXGate.name">
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Return the name.
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</Attribute>
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### num\_clbits
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<Attribute id="qiskit.circuit.library.DCXGate.num_clbits">
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Return the number of clbits.
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</Attribute>
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### num\_qubits
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<Attribute id="qiskit.circuit.library.DCXGate.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.DCXGate.params">
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return instruction params.
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</Attribute>
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### unit
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<Attribute id="qiskit.circuit.library.DCXGate.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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