/
adjoint.py
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/
adjoint.py
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# This code is part of Qiskit.
#
# (C) Copyright IBM 2017, 2021.
#
# 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.
"""
Mixin for gate operator interface.
"""
import sys
from abc import ABC, abstractmethod
if sys.version_info >= (3, 11):
from typing import Self
else:
from typing_extensions import Self
class AdjointMixin(ABC):
"""Abstract Mixin for operator adjoint and transpose operations.
This class defines the following methods
- :meth:`transpose`
- :meth:`conjugate`
- :meth:`adjoint`
The following abstract methods must be implemented by subclasses
using this mixin
- ``conjugate(self)``
- ``transpose(self)``
"""
def adjoint(self) -> Self:
"""Return the adjoint of the CLASS."""
return self.conjugate().transpose()
@abstractmethod
def conjugate(self) -> Self:
"""Return the conjugate of the CLASS."""
@abstractmethod
def transpose(self) -> Self:
"""Return the transpose of the CLASS."""