57 lines
1.9 KiB
Plaintext
57 lines
1.9 KiB
Plaintext
---
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title: QDrift
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description: API reference for qiskit.opflow.evolutions.QDrift
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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.opflow.evolutions.QDrift
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---
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# QDrift
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<Class id="qiskit.opflow.evolutions.QDrift" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.22/qiskit/opflow/evolutions/trotterizations/qdrift.py" signature="QDrift(reps=1)" modifiers="class">
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Bases: [`qiskit.opflow.evolutions.trotterizations.trotterization_base.TrotterizationBase`](qiskit.opflow.evolutions.TrotterizationBase "qiskit.opflow.evolutions.trotterizations.trotterization_base.TrotterizationBase")
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The QDrift Trotterization method, which selects each each term in the Trotterization randomly, with a probability proportional to its weight. Based on the work of Earl Campbell in [https://arxiv.org/abs/1811.08017](https://arxiv.org/abs/1811.08017).
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**Parameters**
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**reps** (`int`) – The number of times to repeat the Trotterization circuit.
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## Methods Defined Here
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### convert
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<Function id="qiskit.opflow.evolutions.QDrift.convert" signature="QDrift.convert(operator)">
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Convert a `SummedOp` into a `ComposedOp` or `CircuitOp` representing an approximation of e^-i\*\`\`op\_sum\`\`.
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**Parameters**
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**operator** ([`OperatorBase`](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")) – The `SummedOp` to evolve.
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**Return type**
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[`OperatorBase`](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")
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**Returns**
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The Operator approximating op\_sum’s evolution.
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**Raises**
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**TypeError** – A non-SummedOps Operator is passed into `convert`.
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</Function>
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## Attributes
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### reps
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<Attribute id="qiskit.opflow.evolutions.QDrift.reps">
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The number of repetitions to use in the Trotterization, improving the approximation accuracy.
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**Return type**
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`int`
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</Attribute>
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</Class>
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