mirror of https://github.com/Qiskit/qiskit.git
67 lines
2.4 KiB
YAML
67 lines
2.4 KiB
YAML
---
|
|
features:
|
|
- |
|
|
Improve the :class:`qiskit.quantum_info.Pauli` operator.
|
|
This class now represents and element from the full N-qubit Pauli group
|
|
including complex coefficients. It now supports the Operator API methods
|
|
including :meth:`~qiskit.quantum_info.Pauli.compose`,
|
|
:meth:`~qiskit.quantum_info.Pauli.dot`,
|
|
:meth:`~qiskit.quantum_info.Pauli.tensor` etc, where compose and dot are
|
|
defined with respect to the full Pauli group.
|
|
|
|
This class also allows conversion to and from the string representation
|
|
of Pauli's for convenience.
|
|
|
|
For example
|
|
|
|
.. code-block::
|
|
|
|
from qiskit.quantum_info import Pauli
|
|
|
|
P1 = Pauli('XYZ')
|
|
P2 = Pauli('YZX')
|
|
P1.dot(P2)
|
|
|
|
Pauli's can also be directly appended to
|
|
:class:`~qiskit.circuit.QuantumCircuit` objects
|
|
|
|
.. code-block::
|
|
|
|
from qiskit import QuantumCircuit
|
|
from qiskit.quantum_info import Pauli
|
|
|
|
circ = QuantumCircuit(3)
|
|
circ.append(Pauli('XYZ'), [0, 1, 2])
|
|
circ.draw(output='mpl')
|
|
|
|
Additional methods allow computing when two Pauli's commute (using the
|
|
:meth:`~qiskit.quantum_info.Pauli.commutes` method) or anticommute
|
|
(using the :meth:`~qiskit.quantum_info.Pauli.anticommutes` method), and
|
|
computing the Pauli resulting from Clifford conjugation
|
|
:math:`P^\prime = C.P.C^\dagger`
|
|
using the :meth:`~qiskit.quantum_info.Pauli.evolve` method.
|
|
|
|
See the API documentation of the :class:`~qiskit.quantum_info.Pauli` class
|
|
for additional information.
|
|
- |
|
|
A new function, :func:`~qiskit.quantum_info.random_pauli`, for generating a
|
|
random element of the N-qubit Pauli group has been added to the
|
|
:mod:`qiskit.quantum_info` module.
|
|
deprecations:
|
|
- |
|
|
The following legacy methods of the :class:`qiskit.quantum_info.Pauli` class
|
|
have been deprecated. See the method documentation for replacement use in
|
|
the updated Pauli class.
|
|
|
|
* :meth:`~qiskit.quantum_info.Pauli.from_label`
|
|
* :meth:`~qiskit.quantum_info.Pauli.sgn_prod`
|
|
* :meth:`~qiskit.quantum_info.Pauli.to_spmatrix`
|
|
* :meth:`~qiskit.quantum_info.Pauli.kron`
|
|
* :meth:`~qiskit.quantum_info.Pauli.update_z`
|
|
* :meth:`~qiskit.quantum_info.Pauli.update_x`
|
|
* :meth:`~qiskit.quantum_info.Pauli.insert_paulis`
|
|
* :meth:`~qiskit.quantum_info.Pauli.append_paulis`
|
|
* :meth:`~qiskit.quantum_info.Pauli.delete_qubits`
|
|
* :meth:`~qiskit.quantum_info.Pauli.pauli_single`
|
|
* :meth:`~qiskit.quantum_info.Pauli.random`
|