example_projectq_entangle.py

"""
This example is copied from https://github.com/ProjectQ-Framework/ProjectQ
and is covered under the Apache 2.0 license.
"""

from getpass import getpass

from coreapi.auth import BasicAuthentication
from projectq import MainEngine
from projectq.backends import ResourceCounter
from projectq.cengines import ManualMapper
from projectq.ops import CNOT, H, Measure, All
from projectq.setups import restrictedgateset

from quantuminspire.api import QuantumInspireAPI
from quantuminspire.projectq.backend_qx import QIBackend


def get_authentication():
    """ Gets the authentication for connecting to the Quantum Inspire API."""
    print('Enter email:')
    email = input()
    print('Enter password')
    password = getpass()
    return BasicAuthentication(email, password)


if __name__ == '__main__':

    name = 'TestProjectQ'
    uri = r'https://api.quantum-inspire.com/'
    if 'authentication' not in vars().keys():
        authentication = get_authentication()
    qi_api = QuantumInspireAPI(uri, authentication, project_name=name)

    compiler_engines = restrictedgateset.get_engine_list(one_qubit_gates="any", two_qubit_gates=(CNOT,))
    compiler_engines.extend([ResourceCounter(), ManualMapper(lambda x: x)])

    qi_backend = QIBackend(quantum_inspire_api=qi_api)
    engine = MainEngine(backend=qi_backend, engine_list=compiler_engines)

    qubits = engine.allocate_qureg(2)
    q1 = qubits[0]
    q2 = qubits[1]

    H | q1
    CNOT | (q1, q2)
    All(Measure) | qubits

    engine.flush()

    print('\nMeasured: {0}'.format([int(q) for q in qubits]))
    print('Probabilities {0}'.format(qi_backend.get_probabilities(qubits)))