510 lines
24 KiB
Plaintext
510 lines
24 KiB
Plaintext
---
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title: ClassicalFunction
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description: API reference for qiskit.circuit.classicalfunction.ClassicalFunction
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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.classicalfunction.ClassicalFunction
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---
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# qiskit.circuit.classicalfunction.ClassicalFunction
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<Class id="qiskit.circuit.classicalfunction.ClassicalFunction" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.17/qiskit/circuit/classicalfunction/classicalfunction.py" signature="ClassicalFunction(source, name=None)" modifiers="class">
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Represent a classical function function and its logic network.
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Creates a `ClassicalFunction` from Python source code in `source`.
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The code should be a single function with types.
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**Parameters**
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* **source** (*str*) – Python code with type hints.
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* **name** (*str*) – Optional. Default: “*classicalfunction*”. ClassicalFunction name.
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**Raises**
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* [**MissingOptionalLibraryError**](qiskit.aqua.MissingOptionalLibraryError "qiskit.aqua.MissingOptionalLibraryError") – If tweedledum is not installed.
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* **QiskitError** – If source is not a string.
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### \_\_init\_\_
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.__init__" signature="__init__(source, name=None)">
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Creates a `ClassicalFunction` from Python source code in `source`.
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The code should be a single function with types.
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**Parameters**
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* **source** (*str*) – Python code with type hints.
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* **name** (*str*) – Optional. Default: “*classicalfunction*”. ClassicalFunction name.
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**Raises**
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* [**MissingOptionalLibraryError**](qiskit.aqua.MissingOptionalLibraryError "qiskit.aqua.MissingOptionalLibraryError") – If tweedledum is not installed.
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* **QiskitError** – If source is not a string.
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</Function>
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## Methods
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| | |
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| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- |
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| [`__init__`](#qiskit.circuit.classicalfunction.ClassicalFunction.__init__ "qiskit.circuit.classicalfunction.ClassicalFunction.__init__")(source\[, name]) | Creates a `ClassicalFunction` from Python source code in `source`. |
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| [`add_decomposition`](#qiskit.circuit.classicalfunction.ClassicalFunction.add_decomposition "qiskit.circuit.classicalfunction.ClassicalFunction.add_decomposition")(decomposition) | Add a decomposition of the instruction to the SessionEquivalenceLibrary. |
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| [`assemble`](#qiskit.circuit.classicalfunction.ClassicalFunction.assemble "qiskit.circuit.classicalfunction.ClassicalFunction.assemble")() | Assemble a QasmQobjInstruction |
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| [`broadcast_arguments`](#qiskit.circuit.classicalfunction.ClassicalFunction.broadcast_arguments "qiskit.circuit.classicalfunction.ClassicalFunction.broadcast_arguments")(qargs, cargs) | Validation and handling of the arguments and its relationship. |
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| [`c_if`](#qiskit.circuit.classicalfunction.ClassicalFunction.c_if "qiskit.circuit.classicalfunction.ClassicalFunction.c_if")(classical, val) | Add classical condition on register classical and value val. |
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| [`compile`](#qiskit.circuit.classicalfunction.ClassicalFunction.compile "qiskit.circuit.classicalfunction.ClassicalFunction.compile")() | Parses and creates the logical circuit |
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| [`control`](#qiskit.circuit.classicalfunction.ClassicalFunction.control "qiskit.circuit.classicalfunction.ClassicalFunction.control")(\[num\_ctrl\_qubits, label, ctrl\_state]) | Return controlled version of gate. |
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| [`copy`](#qiskit.circuit.classicalfunction.ClassicalFunction.copy "qiskit.circuit.classicalfunction.ClassicalFunction.copy")(\[name]) | Copy of the instruction. |
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| [`inverse`](#qiskit.circuit.classicalfunction.ClassicalFunction.inverse "qiskit.circuit.classicalfunction.ClassicalFunction.inverse")() | Invert this instruction. |
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| [`is_parameterized`](#qiskit.circuit.classicalfunction.ClassicalFunction.is_parameterized "qiskit.circuit.classicalfunction.ClassicalFunction.is_parameterized")() | Return True .IFF. |
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| [`mirror`](#qiskit.circuit.classicalfunction.ClassicalFunction.mirror "qiskit.circuit.classicalfunction.ClassicalFunction.mirror")() | DEPRECATED: use instruction.reverse\_ops(). |
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| [`power`](#qiskit.circuit.classicalfunction.ClassicalFunction.power "qiskit.circuit.classicalfunction.ClassicalFunction.power")(exponent) | Creates a unitary gate as gate^exponent. |
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| [`qasm`](#qiskit.circuit.classicalfunction.ClassicalFunction.qasm "qiskit.circuit.classicalfunction.ClassicalFunction.qasm")() | Return a default OpenQASM string for the instruction. |
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| [`repeat`](#qiskit.circuit.classicalfunction.ClassicalFunction.repeat "qiskit.circuit.classicalfunction.ClassicalFunction.repeat")(n) | Creates an instruction with gate repeated n amount of times. |
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| [`reverse_ops`](#qiskit.circuit.classicalfunction.ClassicalFunction.reverse_ops "qiskit.circuit.classicalfunction.ClassicalFunction.reverse_ops")() | For a composite instruction, reverse the order of sub-instructions. |
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| [`simulate`](#qiskit.circuit.classicalfunction.ClassicalFunction.simulate "qiskit.circuit.classicalfunction.ClassicalFunction.simulate")(bitstring) | Evaluate the expression on a bitstring. |
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| [`simulate_all`](#qiskit.circuit.classicalfunction.ClassicalFunction.simulate_all "qiskit.circuit.classicalfunction.ClassicalFunction.simulate_all")() | Returns a truth table. |
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| [`soft_compare`](#qiskit.circuit.classicalfunction.ClassicalFunction.soft_compare "qiskit.circuit.classicalfunction.ClassicalFunction.soft_compare")(other) | Soft comparison between gates. |
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| [`synth`](#qiskit.circuit.classicalfunction.ClassicalFunction.synth "qiskit.circuit.classicalfunction.ClassicalFunction.synth")(\[registerless, synthesizer]) | Synthesis the logic network into a [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit"). |
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| [`to_matrix`](#qiskit.circuit.classicalfunction.ClassicalFunction.to_matrix "qiskit.circuit.classicalfunction.ClassicalFunction.to_matrix")() | Return a Numpy.array for the gate unitary matrix. |
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| [`validate_parameter`](#qiskit.circuit.classicalfunction.ClassicalFunction.validate_parameter "qiskit.circuit.classicalfunction.ClassicalFunction.validate_parameter")(parameter) | Gate parameters should be int, float, or ParameterExpression |
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## Attributes
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| ---------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------- |
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| [`args`](#qiskit.circuit.classicalfunction.ClassicalFunction.args "qiskit.circuit.classicalfunction.ClassicalFunction.args") | Returns the classicalfunction arguments |
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| [`decompositions`](#qiskit.circuit.classicalfunction.ClassicalFunction.decompositions "qiskit.circuit.classicalfunction.ClassicalFunction.decompositions") | Get the decompositions of the instruction from the SessionEquivalenceLibrary. |
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| [`definition`](#qiskit.circuit.classicalfunction.ClassicalFunction.definition "qiskit.circuit.classicalfunction.ClassicalFunction.definition") | Return definition in terms of other basic gates. |
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| [`duration`](#qiskit.circuit.classicalfunction.ClassicalFunction.duration "qiskit.circuit.classicalfunction.ClassicalFunction.duration") | Get the duration. |
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| [`label`](#qiskit.circuit.classicalfunction.ClassicalFunction.label "qiskit.circuit.classicalfunction.ClassicalFunction.label") | Return gate label |
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| [`network`](#qiskit.circuit.classicalfunction.ClassicalFunction.network "qiskit.circuit.classicalfunction.ClassicalFunction.network") | Returns the logical network |
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| [`params`](#qiskit.circuit.classicalfunction.ClassicalFunction.params "qiskit.circuit.classicalfunction.ClassicalFunction.params") | return instruction params. |
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| [`qregs`](#qiskit.circuit.classicalfunction.ClassicalFunction.qregs "qiskit.circuit.classicalfunction.ClassicalFunction.qregs") | The list of qregs used by the classicalfunction |
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| [`scopes`](#qiskit.circuit.classicalfunction.ClassicalFunction.scopes "qiskit.circuit.classicalfunction.ClassicalFunction.scopes") | Returns the scope dict |
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| [`truth_table`](#qiskit.circuit.classicalfunction.ClassicalFunction.truth_table "qiskit.circuit.classicalfunction.ClassicalFunction.truth_table") | Returns (and computes) the truth table |
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| [`types`](#qiskit.circuit.classicalfunction.ClassicalFunction.types "qiskit.circuit.classicalfunction.ClassicalFunction.types") | Dumps a list of scopes with their variables and types. |
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| [`unit`](#qiskit.circuit.classicalfunction.ClassicalFunction.unit "qiskit.circuit.classicalfunction.ClassicalFunction.unit") | Get the time unit of duration. |
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### add\_decomposition
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.add_decomposition" signature="add_decomposition(decomposition)">
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Add a decomposition of the instruction to the SessionEquivalenceLibrary.
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</Function>
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### args
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<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.args">
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Returns the classicalfunction arguments
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</Attribute>
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### assemble
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.assemble" signature="assemble()">
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Assemble a QasmQobjInstruction
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**Return type**
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`Instruction`
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</Function>
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### broadcast\_arguments
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.broadcast_arguments" signature="broadcast_arguments(qargs, cargs)">
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Validation and handling of the arguments and its relationship.
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For example, `cx([q[0],q[1]], q[2])` means `cx(q[0], q[2]); cx(q[1], q[2])`. This method yields the arguments in the right grouping. In the given example:
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```python
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in: [[q[0],q[1]], q[2]],[]
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outs: [q[0], q[2]], []
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[q[1], q[2]], []
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```
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The general broadcasting rules are:
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> * If len(qargs) == 1:
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>
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> ```python
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> [q[0], q[1]] -> [q[0]],[q[1]]
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> ```
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>
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> * If len(qargs) == 2:
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>
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> ```python
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> [[q[0], q[1]], [r[0], r[1]]] -> [q[0], r[0]], [q[1], r[1]]
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> [[q[0]], [r[0], r[1]]] -> [q[0], r[0]], [q[0], r[1]]
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> [[q[0], q[1]], [r[0]]] -> [q[0], r[0]], [q[1], r[0]]
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> ```
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>
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> * If len(qargs) >= 3:
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>
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> ```python
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> [q[0], q[1]], [r[0], r[1]], ...] -> [q[0], r[0], ...], [q[1], r[1], ...]
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> ```
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**Parameters**
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* **qargs** (`List`) – List of quantum bit arguments.
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* **cargs** (`List`) – List of classical bit arguments.
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**Return type**
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`Tuple`\[`List`, `List`]
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**Returns**
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A tuple with single arguments.
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**Raises**
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**CircuitError** – If the input is not valid. For example, the number of arguments does not match the gate expectation.
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</Function>
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### c\_if
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.c_if" signature="c_if(classical, val)">
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Add classical condition on register classical and value val.
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</Function>
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### compile
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.compile" signature="compile()">
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Parses and creates the logical circuit
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</Function>
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### control
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.control" signature="control(num_ctrl_qubits=1, label=None, ctrl_state=None)">
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Return controlled version of gate. See [`ControlledGate`](qiskit.circuit.ControlledGate "qiskit.circuit.ControlledGate") for usage.
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**Parameters**
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* **num\_ctrl\_qubits** (`Optional`\[`int`]) – number of controls to add to gate (default=1)
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* **label** (`Optional`\[`str`]) – optional gate label
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* **ctrl\_state** (`Union`\[`int`, `str`, `None`]) – The control state in decimal or as a bitstring (e.g. ‘111’). If None, use 2\*\*num\_ctrl\_qubits-1.
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**Returns**
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Controlled version of gate. This default algorithm uses num\_ctrl\_qubits-1 ancillae qubits so returns a gate of size num\_qubits + 2\*num\_ctrl\_qubits - 1.
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**Return type**
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[qiskit.circuit.ControlledGate](qiskit.circuit.ControlledGate "qiskit.circuit.ControlledGate")
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**Raises**
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**QiskitError** – unrecognized mode or invalid ctrl\_state
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</Function>
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### copy
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.copy" signature="copy(name=None)">
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Copy of the instruction.
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**Parameters**
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**name** (*str*) – name to be given to the copied circuit, if None then the name stays the same.
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**Returns**
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**a copy of the current instruction, with the name**
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updated if it was provided
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**Return type**
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[qiskit.circuit.Instruction](qiskit.circuit.Instruction "qiskit.circuit.Instruction")
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</Function>
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### decompositions
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<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.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.classicalfunction.ClassicalFunction.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.classicalfunction.ClassicalFunction.duration">
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Get the duration.
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</Attribute>
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### inverse
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.inverse" signature="inverse()">
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Invert this instruction.
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If the instruction is composite (i.e. has a definition), then its definition will be recursively inverted.
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Special instructions inheriting from Instruction can implement their own inverse (e.g. T and Tdg, Barrier, etc.)
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**Returns**
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a fresh instruction for the inverse
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**Return type**
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[qiskit.circuit.Instruction](qiskit.circuit.Instruction "qiskit.circuit.Instruction")
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**Raises**
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**CircuitError** – if the instruction is not composite and an inverse has not been implemented for it.
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</Function>
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### is\_parameterized
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.is_parameterized" signature="is_parameterized()">
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Return True .IFF. instruction is parameterized else False
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</Function>
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### label
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<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.label">
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Return gate label
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**Return type**
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`str`
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</Attribute>
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### mirror
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.mirror" signature="mirror()">
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DEPRECATED: use instruction.reverse\_ops().
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**Returns**
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**a new instruction with sub-instructions**
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reversed.
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**Return type**
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[qiskit.circuit.Instruction](qiskit.circuit.Instruction "qiskit.circuit.Instruction")
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</Function>
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### network
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<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.network">
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Returns the logical network
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</Attribute>
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### params
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<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.params">
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return instruction params.
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</Attribute>
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### power
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.power" signature="power(exponent)">
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Creates a unitary gate as gate^exponent.
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**Parameters**
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**exponent** (*float*) – Gate^exponent
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**Returns**
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To which to\_matrix is self.to\_matrix^exponent.
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**Return type**
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[qiskit.extensions.UnitaryGate](qiskit.extensions.UnitaryGate "qiskit.extensions.UnitaryGate")
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**Raises**
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**CircuitError** – If Gate is not unitary
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</Function>
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### qasm
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.qasm" signature="qasm()">
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Return a default OpenQASM string for the instruction.
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Derived instructions may override this to print in a different format (e.g. measure q\[0] -> c\[0];).
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</Function>
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### qregs
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<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.qregs">
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The list of qregs used by the classicalfunction
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</Attribute>
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### repeat
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.repeat" signature="repeat(n)">
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Creates an instruction with gate repeated n amount of times.
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**Parameters**
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**n** (*int*) – Number of times to repeat the instruction
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**Returns**
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Containing the definition.
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**Return type**
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[qiskit.circuit.Instruction](qiskit.circuit.Instruction "qiskit.circuit.Instruction")
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**Raises**
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**CircuitError** – If n \< 1.
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</Function>
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### reverse\_ops
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.reverse_ops" signature="reverse_ops()">
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For a composite instruction, reverse the order of sub-instructions.
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This is done by recursively reversing all sub-instructions. It does not invert any gate.
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**Returns**
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**a new instruction with**
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sub-instructions reversed.
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**Return type**
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[qiskit.circuit.Instruction](qiskit.circuit.Instruction "qiskit.circuit.Instruction")
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</Function>
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### scopes
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<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.scopes">
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Returns the scope dict
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</Attribute>
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### simulate
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.simulate" signature="simulate(bitstring)">
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Evaluate the expression on a bitstring.
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This evaluation is done classically.
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**Parameters**
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**bitstring** (`str`) – The bitstring for which to evaluate.
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**Returns**
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result of the evaluation.
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**Return type**
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bool
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</Function>
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### simulate\_all
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.simulate_all" signature="simulate_all()">
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Returns a truth table.
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**Returns**
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a bitstring with a truth table
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**Return type**
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str
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</Function>
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### soft\_compare
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.soft_compare" signature="soft_compare(other)">
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Soft comparison between gates. Their names, number of qubits, and classical bit numbers must match. The number of parameters must match. Each parameter is compared. If one is a ParameterExpression then it is not taken into account.
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**Parameters**
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**other** (*instruction*) – other instruction.
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**Returns**
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are self and other equal up to parameter expressions.
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**Return type**
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bool
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</Function>
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### synth
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.synth" signature="synth(registerless=True, synthesizer=None)">
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Synthesis the logic network into a [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit").
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**Parameters**
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* **registerless** (`bool`) – Default `True`. If `False` uses the parameter names to create
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* **with those names. Otherwise** (*registers*) –
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* **a circuit with a flat quantum register.** (*creates*) –
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* **synthesizer** (`Optional`\[`Callable`\[\[`ClassicalElement`], `QuantumCircuit`]]) – Optional. If None tweedledum’s pkrm\_synth is used.
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**Returns**
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A circuit implementing the logic network.
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**Return type**
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[QuantumCircuit](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit")
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</Function>
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### to\_matrix
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<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.to_matrix" signature="to_matrix()">
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Return a Numpy.array for the gate unitary matrix.
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**Returns**
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if the Gate subclass has a matrix definition.
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**Return type**
|
||
|
||
np.ndarray
|
||
|
||
**Raises**
|
||
|
||
**CircuitError** – If a Gate subclass does not implement this method an exception will be raised when this base class method is called.
|
||
</Function>
|
||
|
||
### truth\_table
|
||
|
||
<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.truth_table">
|
||
Returns (and computes) the truth table
|
||
</Attribute>
|
||
|
||
### types
|
||
|
||
<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.types">
|
||
Dumps a list of scopes with their variables and types.
|
||
|
||
**Returns**
|
||
|
||
A list of scopes as dicts, where key is the variable name and value is its type.
|
||
|
||
**Return type**
|
||
|
||
list(dict)
|
||
</Attribute>
|
||
|
||
### unit
|
||
|
||
<Attribute id="qiskit.circuit.classicalfunction.ClassicalFunction.unit">
|
||
Get the time unit of duration.
|
||
</Attribute>
|
||
|
||
### validate\_parameter
|
||
|
||
<Function id="qiskit.circuit.classicalfunction.ClassicalFunction.validate_parameter" signature="validate_parameter(parameter)">
|
||
Gate parameters should be int, float, or ParameterExpression
|
||
</Function>
|
||
</Class>
|
||
|