#!/usr/bin/python3
# -*- coding: utf8 -*-

# Copyright (c) 2022 Baidu, Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
This is a simple case of using Hadamard gate and CNOT gate to generate a GHZ state.
Results will be fetched from a local program.
"""

import sys
from pprint import pprint

sys.path.append('../..')
from QCompute import *

matchSdkVersion('Python 3.3.3')

# Create environment
env = QEnv()
# Choose backend Baidu local simulator
env.backend(BackendName.LocalBaiduSim2)

# Initialize the three-qubit circuit
q = env.Q.createList(3)

# Apply a Hadamard gate on the 0th qubit
H(q[0])

# Apply some CX gates where the 0th qubit controls flipping each other qubit
CX(q[0], q[1])
CX(q[0], q[2])

# Measure with the computational basis
MeasureZ(*env.Q.toListPair())

# Commit the task with 1024 shots
taskResult = env.commit(1024, fetchMeasure=True)

pprint(taskResult)