IntegerComparator
class IntegerComparator(num_state_qubits=None, value=None, geq=True, name='cmp')
Bases: qiskit.circuit.library.blueprintcircuit.BlueprintCircuit
Integer Comparator.
Operator compares basis states against a classically given integer of fixed value and flips a target qubit if (or depending on the parameter geq):
This operation is based on two’s complement implementation of binary subtraction but only uses carry bits and no actual result bits. If the most significant carry bit (the results bit) is 1, the condition is True otherwise it is False.
Create a new fixed value comparator circuit.
Parameters
- num_state_qubits (
Optional[int]) – Number of state qubits. If this is set it will determine the number of qubits required for the circuit. - value (
Optional[int]) – The fixed value to compare with. - geq (
bool) – If True, evaluate a>=condition, else<. - name (
str) – Name of the circuit.
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
data
extension_lib
Default value: 'include "qelib1.inc";'
geq
Return whether the comparator compares greater or less equal.
Return type
bool
Returns
True, if the comparator compares >=, False if <.
global_phase
header
Default value: 'OPENQASM 2.0;'
instances
Default value: 2368
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_ancilla_qubits
Deprecated. Use num_ancillas instead.
num_ancillas
Return the number of ancilla qubits.
Return type
int
num_clbits
Return number of classical bits.
Return type
int
num_parameters
Return type
int
num_qubits
Return number of qubits.
Return type
int
num_state_qubits
The number of qubits encoding the state for the comparison.
Return type
int
Returns
The number of state qubits.
op_start_times
Return a list of operation start times.
This attribute is enabled once one of scheduling analysis passes runs on the quantum circuit.
Return type
List[int]
Returns
List of integers representing instruction start times. The index corresponds to the index of instruction in QuantumCircuit.data.
Raises
AttributeError – When circuit is not scheduled.
parameters
Return type
ParameterView
prefix
Default value: 'circuit'
qregs
A list of the quantum registers associated with the circuit.
qubits
value
The value to compare the qubit register to.
Return type
int
Returns
The value against which the value of the qubit register is compared.