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rzx_zz2.py
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rzx_zz2.py
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# This code is part of Qiskit.
#
# (C) Copyright IBM 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.
"""
RZX based template for CX - PhaseGate - CX
.. parsed-literal::
»
q_0: ──■────────────■─────────────────────────────────────────────────────»
┌─┴─┐┌──────┐┌─┴─┐┌───────┐┌─────────┐┌─────────┐┌─────────┐┌───────┐»
q_1: ┤ X ├┤ P(ϴ) ├┤ X ├┤ P(-ϴ) ├┤ RZ(π/2) ├┤ RX(π/2) ├┤ RZ(π/2) ├┤ RX(ϴ) ├»
└───┘└──────┘└───┘└───────┘└─────────┘└─────────┘└─────────┘└───────┘»
« ┌──────────┐
«q_0: ┤0 ├─────────────────────────────────
« │ RZX(-ϴ) │┌─────────┐┌─────────┐┌─────────┐
«q_1: ┤1 ├┤ RZ(π/2) ├┤ RX(π/2) ├┤ RZ(π/2) ├
« └──────────┘└─────────┘└─────────┘└─────────┘
"""
from __future__ import annotations
import numpy as np
from qiskit.circuit import Parameter, QuantumCircuit
from qiskit.circuit.parameterexpression import ParameterValueType
def rzx_zz2(theta: ParameterValueType | None = None):
"""Template for CX - RZGate - CX."""
if theta is None:
theta = Parameter("ϴ")
qc = QuantumCircuit(2)
qc.cx(0, 1)
qc.p(theta, 1)
qc.cx(0, 1)
qc.p(-1 * theta, 1)
# Hadamard
qc.rz(np.pi / 2, 1)
qc.rx(np.pi / 2, 1)
qc.rz(np.pi / 2, 1)
qc.rx(theta, 1)
qc.rzx(-1 * theta, 0, 1)
# Hadamard
qc.rz(np.pi / 2, 1)
qc.rx(np.pi / 2, 1)
qc.rz(np.pi / 2, 1)
return qc