/
inner_product.py
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/
inner_product.py
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# -*- coding: utf-8 -*-
# This code is part of Qiskit.
#
# (C) Copyright IBM 2020.
#
# 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.
# pylint: disable=no-member
"""InnerProduct circuit."""
from qiskit.circuit import QuantumRegister, QuantumCircuit
class InnerProduct(QuantumCircuit):
"""An n_qubit circuit that computes the inner product of two registers."""
def __init__(self, num_qubits: int) -> None:
"""Return a circuit to compute the inner product of 2 n-qubit registers.
This implementation uses CZ gates.
Args:
num_qubits: width of top and bottom registers (half total circuit width)
Reference Circuit:
.. jupyter-execute::
:hide-code:
from qiskit.circuit.library import InnerProduct
import qiskit.tools.jupyter
circuit = InnerProduct(5)
%circuit_library_info circuit
"""
qr_a = QuantumRegister(num_qubits)
qr_b = QuantumRegister(num_qubits)
super().__init__(qr_a, qr_b, name="inner_product")
for i in range(num_qubits):
self.cz(qr_a[i], qr_b[i])