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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.","","\"\"\"Create a new first-order Pauli-Z expansion circuit.\"\"\"","","from typing import Callable, Optional","import numpy as np","","from .pauli_feature_map import PauliFeatureMap","","","class ZFeatureMap(PauliFeatureMap):"," \"\"\"The first order Pauli Z-evolution circuit.",""," On 3 qubits and with 2 repetitions the circuit is represented by:",""," .. parsed-literal::",""," ┌───┐┌──────────────┐┌───┐┌──────────────┐"," ┤ H ├┤ U1(2.0*x[0]) ├┤ H ├┤ U1(2.0*x[0]) ├"," ├───┤├──────────────┤├───┤├──────────────┤"," ┤ H ├┤ U1(2.0*x[1]) ├┤ H ├┤ U1(2.0*x[1]) ├"," ├───┤├──────────────┤├───┤├──────────────┤"," ┤ H ├┤ U1(2.0*x[2]) ├┤ H ├┤ U1(2.0*x[2]) ├"," └───┘└──────────────┘└───┘└──────────────┘",""," This is a sub-class of :class:`~qiskit.circuit.library.PauliFeatureMap` where the Pauli"," strings are fixed as `['Z']`. 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