def test_switch_backend1():
c = Circuit().x[0].h[0]
assert np.array_equal(c.run(), c.run(backend="numpy"))
BlueqatGlobalSetting.set_default_backend("qasm_output")
assert c.run() == c.to_qasm()
# Different instance of QasmOutputBackend is used.
# Lhs is owned by Circuit, rhs is passed as argument. But in this case same result.
from blueqat.backends.qasm_output_backend import QasmOutputBackend
assert c.run(output_prologue=False) == c.run(False, backend=QasmOutputBackend())
BlueqatGlobalSetting.set_default_backend("numpy")
assert c.run(shots=5) == c.run_with_numpy(shots=5)
:returns Vqe object
"""
sampler = sampler or vqe.non_sampling_sampler
minimizer = minimizer or vqe.get_scipy_minimizer(
method="Powell",
options={"ftol": 5.0e-2, "xtol": 5.0e-2, "maxiter": 1000, "disp": True}
)
hamiltonian = pauli.I() * 0
for i, j in edges:
hamiltonian += pauli.Z(i) * pauli.Z(j)
return vqe.Vqe(vqe.QaoaAnsatz(hamiltonian, n_step), minimizer, sampler)
if __name__ == "__main__":
print("Input token:")
token = input().strip()
BlueqatGlobalSetting.set_default_backend("mqc")
#sampler = vqe.get_measurement_sampler(1024)
sampler = vqe.get_measurement_sampler(1024, {"token": token})
runner = maxcut_qaoa(2, [(0, 1), (1, 2), (2, 3), (3, 0), (1, 3), (0, 2), (4, 0), (4, 3)], sampler=sampler)
result = runner.run(verbose=True)
print("""
{4}
/ \\
{0}---{3}
| x |
{1}---{2}
""".format(*result.most_common()[0][0]))