OR¶

class
OR
(num_variable_qubits, flags=None, mcx_mode='noancilla')[source]¶ 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 isTrue
. The OR is implemented using a multiopencontrolled 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 isFalse
or one of the last two areTrue
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 multicontrolled X gate.
Attributes

ancillas
¶ Returns a list of ancilla bits in the order that the registers were added.
 Return type
List
[AncillaQubit
]

calibrations
¶ Return calibration dictionary.
 The custom pulse definition of a given gate is of the form
{‘gate_name’: {(qubits, params): schedule}}
 Return type
dict

clbits
¶ Returns a list of classical bits in the order that the registers were added.
 Return type
List
[Clbit
]

data
¶ Return the circuit data (instructions and context).
 Returns
a listlike object containing the tuples for the circuit’s 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

extension_lib
= 'include "qelib1.inc";'¶

global_phase
¶ Return the global phase of the circuit in radians.
 Return type
Union
[ParameterExpression
,float
]

header
= 'OPENQASM 2.0;'¶

instances
= 9¶

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. Return type
dict

num_ancillas
¶ Return the number of ancilla qubits.
 Return type
int

num_clbits
¶ Return number of classical bits.
 Return type
int

num_parameters
¶ Convenience function to get the number of parameter objects in the circuit.
 Return type
int

num_qubits
¶ Return number of qubits.
 Return type
int

parameters
¶ Convenience function to get the parameters defined in the parameter table.
 Return type
ParameterView

prefix
= 'circuit'¶

qubits
¶ Returns a list of quantum bits in the order that the registers were added.
 Return type
List
[Qubit
]