def test_phase_invalid_function():
main_engine = MainEngine(backend=DummyEngine(),
engine_list=[DummyEngine()])
qureg = main_engine.allocate_qureg(3)
with pytest.raises(AttributeError):
PhaseOracle(-42) | qureg
with pytest.raises(AttributeError):
PhaseOracle(0xcafe) | qureg
with pytest.raises(RuntimeError):
PhaseOracle(0x8e, synth=lambda: revkit.esopbs()) | qureg
def test_phase_majority():
sim = Simulator()
main_engine = MainEngine(sim)
qureg = main_engine.allocate_qureg(3)
All(H) | qureg
PhaseOracle(0xe8) | qureg
main_engine.flush()
assert np.array_equal(np.sign(sim.cheat()[1]),
[1., 1., 1., -1., 1., -1., -1., -1.])
All(Measure) | qureg
def test_phase_majority_from_python():
dormouse = pytest.importorskip('dormouse')
def maj(a, b, c):
return (a and b) or (a and c) or (b and c) # pragma: no cover
sim = Simulator()
main_engine = MainEngine(sim)
qureg = main_engine.allocate_qureg(3)
All(H) | qureg
PhaseOracle(maj) | qureg
main_engine.flush()
assert np.array_equal(np.sign(sim.cheat()[1]),
[1., 1., 1., -1., 1., -1., -1., -1.])
All(Measure) | qureg
# permutation
pi = [0, 2, 3, 5, 7, 1, 4, 6]
eng = MainEngine()
qubits = eng.allocate_qureg(6)
x = qubits[::2] # qubits on odd lines
y = qubits[1::2] # qubits on even lines
# circuit
with Compute(eng):
All(H) | qubits
All(X) | [x[0], x[1]]
PermutationOracle(pi) | y
PhaseOracle(f) | qubits
Uncompute(eng)
with Compute(eng):
with Dagger(eng):
PermutationOracle(pi, synth=revkit.dbs) | x
PhaseOracle(f) | qubits
Uncompute(eng)
All(H) | qubits
All(Measure) | qubits
# measurement result
print("Shift is {}".format(sum(int(q) << i for i, q in enumerate(qubits))))