49 lines
2.2 KiB
Plaintext
49 lines
2.2 KiB
Plaintext
---
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title: TwoQubitReduction
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description: API reference for qiskit.opflow.converters.TwoQubitReduction
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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.converters.TwoQubitReduction
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---
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# TwoQubitReduction
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<Class id="qiskit.opflow.converters.TwoQubitReduction" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.24/qiskit/opflow/converters/two_qubit_reduction.py" signature="TwoQubitReduction(num_particles)" modifiers="class">
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Bases: [`ConverterBase`](qiskit.opflow.converters.ConverterBase "qiskit.opflow.converters.converter_base.ConverterBase")
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Deprecated: Two qubit reduction converter which eliminates the central and last qubit in a list of Pauli that has diagonal operators (Z,I) at those positions.
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Chemistry specific method: It can be used to taper two qubits in parity and binary-tree mapped fermionic Hamiltonians when the spin orbitals are ordered in two spin sectors, (block spin order) according to the number of particles in the system.
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<Admonition title="Deprecated since version 0.24.0" type="danger">
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The class `qiskit.opflow.converters.two_qubit_reduction.TwoQubitReduction` is deprecated as of qiskit-terra 0.24.0. It will be removed no earlier than 3 months after the release date. For code migration guidelines, visit [https://qisk.it/opflow\_migration](https://qisk.it/opflow_migration).
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</Admonition>
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**Parameters**
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**num\_particles** (*int | List\[int] | Tuple\[int, int]*) – number of particles, if it is a list, the first number is alpha and the second number if beta.
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## Methods Defined Here
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<span id="qiskit-opflow-converters-twoqubitreduction-convert" />
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### convert
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<Function id="qiskit.opflow.converters.TwoQubitReduction.convert" signature="TwoQubitReduction.convert(operator)">
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Converts the Operator to tapered one by Z2 symmetries.
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**Parameters**
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**operator** ([*OperatorBase*](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")) – the operator
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**Returns**
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A new operator whose qubit number is reduced by 2.
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**Return type**
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[*OperatorBase*](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")
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</Function>
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</Class>
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