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measure.py
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measure.py
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# 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 http://www.apache.org/licenses/LICENSE-2.0.
#
# 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.
"""
from qiskit.circuit.singleton import SingletonInstruction, stdlib_singleton_key
from qiskit.circuit.exceptions import CircuitError
class Measure(SingletonInstruction):
"""Quantum measurement in the computational basis."""
def __init__(self, label=None, *, duration=None, unit="dt"):
"""
Args:
label: optional string label for this instruction.
"""
super().__init__("measure", 1, 1, [], label=label, duration=duration, unit=unit)
_singleton_lookup_key = stdlib_singleton_key()
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")