qiskit-documentation/docs/api/qiskit/0.29/qiskit.circuit.library.OR.mdx

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---
title: OR
description: API reference for qiskit.circuit.library.OR
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.circuit.library.OR
---
# OR
<Class id="qiskit.circuit.library.OR" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.18/qiskit/circuit/library/boolean_logic/quantum_or.py" signature="OR(num_variable_qubits, flags=None, mcx_mode='noancilla')" modifiers="class">
Bases: `qiskit.circuit.quantumcircuit.QuantumCircuit`
A circuit implementing the logical OR operation on a number of qubits.
For the OR operation the state $|1\rangle$ is interpreted as `True`. The result qubit is flipped, if the state of any variable qubit is `True`. The OR is implemented using a multi-open-controlled X gate (i.e. flips if the state is $|0\rangle$) and applying an X gate on the result qubit. Using a list of flags, qubits can be skipped or negated.
The OR gate without special flags:
Using flags we can negate qubits or skip them. For instance, if we have 5 qubits and want to return `True` if the first qubit is `False` or one of the last two are `True` we use the flags `[-1, 0, 0, 1, 1]`.
Create a new logical OR circuit.
**Parameters**
* **num\_variable\_qubits** (`int`) The qubits of which the OR is computed. The result will be written into an additional result qubit.
* **flags** (`Optional`\[`List`\[`int`]]) A list of +1/0/-1 marking negations or omissions of qubits.
* **mcx\_mode** (`str`) The mode to be used to implement the multi-controlled X gate.
## Attributes
### ancillas
<Attribute id="qiskit.circuit.library.OR.ancillas">
Returns a list of ancilla bits in the order that the registers were added.
</Attribute>
### calibrations
<Attribute id="qiskit.circuit.library.OR.calibrations">
Return calibration dictionary.
**The custom pulse definition of a given gate is of the form**
\{gate\_name: \{(qubits, params): schedule}}
</Attribute>
### clbits
<Attribute id="qiskit.circuit.library.OR.clbits">
Returns a list of classical bits in the order that the registers were added.
</Attribute>
### data
<Attribute id="qiskit.circuit.library.OR.data">
Return the circuit data (instructions and context).
**Returns**
a list-like object containing the tuples for the circuits data.
Each tuple is in the format `(instruction, qargs, cargs)`, where instruction is an Instruction (or subclass) object, qargs is a list of Qubit objects, and cargs is a list of Clbit objects.
**Return type**
QuantumCircuitData
</Attribute>
### extension\_lib
<Attribute id="qiskit.circuit.library.OR.extension_lib" attributeValue="'include &#x22;qelib1.inc&#x22;;'" />
### global\_phase
<Attribute id="qiskit.circuit.library.OR.global_phase">
Return the global phase of the circuit in radians.
</Attribute>
### header
<Attribute id="qiskit.circuit.library.OR.header" attributeValue="'OPENQASM 2.0;'" />
### instances
<Attribute id="qiskit.circuit.library.OR.instances" attributeValue="16" />
### metadata
<Attribute id="qiskit.circuit.library.OR.metadata">
The user provided metadata associated with the circuit
The metadata for the circuit is a user provided `dict` of metadata for the circuit. It will not be used to influence the execution or operation of the circuit, but it is expected to be passed between all transforms of the circuit (ie transpilation) and that providers will associate any circuit metadata with the results it returns from execution of that circuit.
</Attribute>
### num\_ancillas
<Attribute id="qiskit.circuit.library.OR.num_ancillas">
Return the number of ancilla qubits.
</Attribute>
### num\_clbits
<Attribute id="qiskit.circuit.library.OR.num_clbits">
Return number of classical bits.
</Attribute>
### num\_parameters
<Attribute id="qiskit.circuit.library.OR.num_parameters">
Convenience function to get the number of parameter objects in the circuit.
</Attribute>
### num\_qubits
<Attribute id="qiskit.circuit.library.OR.num_qubits">
Return number of qubits.
</Attribute>
### parameters
<Attribute id="qiskit.circuit.library.OR.parameters">
Convenience function to get the parameters defined in the parameter table.
</Attribute>
### prefix
<Attribute id="qiskit.circuit.library.OR.prefix" attributeValue="'circuit'" />
### qubits
<Attribute id="qiskit.circuit.library.OR.qubits">
Returns a list of quantum bits in the order that the registers were added.
</Attribute>
</Class>