Code source de qiskit.circuit.measure

# This code is part of Qiskit.
# (C) Copyright IBM 2017.
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.

Quantum measurement in the computational basis.

import warnings

from qiskit.circuit.instruction import Instruction
from qiskit.circuit.exceptions import CircuitError

[docs]class Measure(Instruction): """Quantum measurement in the computational basis.""" def __init__(self): """Create new measurement instruction.""" super().__init__("measure", 1, 1, [])
[docs] def broadcast_arguments(self, qargs, cargs): qarg = qargs[0] carg = cargs[0] if len(carg) == len(qarg): for qarg, carg in zip(qarg, carg): yield [qarg], [carg] elif len(qarg) == 1 and carg: for each_carg in carg: yield qarg, [each_carg] else: raise CircuitError("register size error")
def measure(circuit, qubit, clbit): """Measure a quantum bit into classical bit. .. deprecated:: Qiskit Terra 0.19 Use :meth:`.QuantumCircuit.measure` instead, either by calling ``circuit.measure(qubit, clbit)``, or if a full function is required, then ``QuantumCircuit.measure(circuit, qubit, clbit)``. Args: circuit (QuantumCircuit): the quantum circuit to attach the measurement to. qubit (Union[Qubit, int]): the quantum bit to measure clbit (Union[Clbit, int]): the classical bit to store the measurement result in. Returns: .InstructionSet: a handle to the created instruction. Raises: CircuitError: if either bit is not in the circuit, or is in a bad format. """ warnings.warn( "The loose 'measure' function is deprecated as of Qiskit Terra 0.19, and will be removed" " in a future release. Instead, you should call 'circuit.measure(qubit, clbit)', or if you" " need a function, you can do `QuantumCircuit.measure(circuit, qubit, clbit)'.", category=DeprecationWarning, stacklevel=2, ) return circuit.measure(qubit, clbit)