observable_test.cpp

/*
# This code is part of Qiskit.
#
# (C) Copyright IBM 2024.
#
# 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.
*/

// Test quantm circuit of Qiskit C++

#include <iostream>
#include <cstdint>

#include "quantum_info/sparse_observable.hpp"

using namespace Qiskit::quantum_info;

int main()
{
    auto a = SparseObservable::zero(10);
    auto b = SparseObservable::identity(10);
    a += b;
    std::cout << a.to_string() <<std::endl;


    std::string label = "-III+IZIXXYXI";
    auto c = SparseObservable::from_label(label);
    std::cout << c.to_string() <<std::endl;

    std::vector<std::pair<std::string, std::complex<double>>> list;
    list.push_back(std::make_pair(std::string("IIIXXIZYII"), std::complex<double>(1.0)));
    list.push_back(std::make_pair(std::string("I++IZIIXII"), std::complex<double>(-1.0)));
    auto d = SparseObservable::from_list(list);
    std::cout << d.to_string() <<std::endl;

    return 0;
}