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Deprecate
qiskit.extensions (Qiskit#10725)
* big moves, import still works * most tests pass (some I cannot seem to run locally) * fix tests -- how to remove DiagonalGate? * typehints and docs * more type hints * Deprecate SQU * deprecate Snapshot * Fix missing future annotations import * minimize deprecation effort * Change to pending deprecation, no exact-location import supported * fix MCG<->MGC typo and snapshot deprecation * fix pylint, try fixing docs * remove gates from extensions toctree * Add reno, fully deprecate SQU and Snapshot * Apply Sasha's review comments - fix usage of .squ and .snapshot w/o import - fix docstring usage of extensions - fix tests * capture snapshot deprecation warning * review comments - capture warning of SQU - update reno to explicitly mention pending deprecation, add DiagonalGate and ExtensionError * missed `diagonal` method --------- Co-authored-by: Alexander Ivrii <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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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. | ||
|
|
||
| """ | ||
| Initialize qubit registers to desired arbitrary state. | ||
| """ | ||
|
|
||
| from __future__ import annotations | ||
| from collections.abc import Sequence | ||
| import typing | ||
|
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||
| from qiskit.circuit.quantumcircuit import QuantumCircuit | ||
| from qiskit.circuit.quantumregister import QuantumRegister | ||
| from qiskit.circuit.instruction import Instruction | ||
| from .state_preparation import StatePreparation | ||
|
|
||
| if typing.TYPE_CHECKING: | ||
| from qiskit.quantum_info.states.statevector import Statevector | ||
|
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| _EPS = 1e-10 # global variable used to chop very small numbers to zero | ||
|
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|
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| class Initialize(Instruction): | ||
| """Complex amplitude initialization. | ||
| Class that initializes some flexible collection of qubit registers, implemented by calling | ||
| the :class:`~.library.StatePreparation` class. | ||
| Note that ``Initialize`` is an :class:`~.circuit.Instruction` and not a :class:`.Gate` since it | ||
| contains a reset instruction, which is not unitary. | ||
| """ | ||
|
|
||
| def __init__( | ||
| self, | ||
| params: Statevector | Sequence[complex] | str | int, | ||
| num_qubits: int | None = None, | ||
| normalize: bool = False, | ||
| ) -> None: | ||
| r""" | ||
| Args: | ||
| params: The state to initialize to, can be either of the following. | ||
| * Statevector or vector of complex amplitudes to initialize to. | ||
| * Labels of basis states of the Pauli eigenstates Z, X, Y. See | ||
| :meth:`.Statevector.from_label`. Notice the order of the labels is reversed with | ||
| respect to the qubit index to be applied to. Example label '01' initializes the | ||
| qubit zero to :math:`|1\rangle` and the qubit one to :math:`|0\rangle`. | ||
| * An integer that is used as a bitmap indicating which qubits to initialize to | ||
| :math:`|1\rangle`. Example: setting params to 5 would initialize qubit 0 and qubit | ||
| 2 to :math:`|1\rangle` and qubit 1 to :math:`|0\rangle`. | ||
| num_qubits: This parameter is only used if params is an int. Indicates the total | ||
| number of qubits in the `initialize` call. Example: `initialize` covers 5 qubits | ||
| and params is 3. This allows qubits 0 and 1 to be initialized to :math:`|1\rangle` | ||
| and the remaining 3 qubits to be initialized to :math:`|0\rangle`. | ||
| normalize: Whether to normalize an input array to a unit vector. | ||
| """ | ||
| self._stateprep = StatePreparation(params, num_qubits, normalize=normalize) | ||
|
|
||
| super().__init__("initialize", self._stateprep.num_qubits, 0, self._stateprep.params) | ||
|
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| def _define(self): | ||
| q = QuantumRegister(self.num_qubits, "q") | ||
| initialize_circuit = QuantumCircuit(q, name="init_def") | ||
| initialize_circuit.reset(q) | ||
| initialize_circuit.append(self._stateprep, q) | ||
| self.definition = initialize_circuit | ||
|
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||
| def gates_to_uncompute(self) -> QuantumCircuit: | ||
| """Call to create a circuit with gates that take the desired vector to zero. | ||
| Returns: | ||
| Circuit to take ``self.params`` vector to :math:`|{00\\ldots0}\\rangle` | ||
| """ | ||
| return self._stateprep._gates_to_uncompute() | ||
|
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||
| @property | ||
| def params(self): | ||
| """Return initialize params.""" | ||
| return self._stateprep.params | ||
|
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| @params.setter | ||
| def params(self, parameters: Statevector | Sequence[complex] | str | int) -> None: | ||
| """Set initialize params.""" | ||
| self._stateprep.params = parameters | ||
|
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| def broadcast_arguments(self, qargs, cargs): | ||
| return self._stateprep.broadcast_arguments(qargs, cargs) |
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