def test_resource_counter_measurement():
eng = MainEngine(ResourceCounter(), [])
qb1 = WeakQubitRef(engine=eng, idx=1)
qb2 = WeakQubitRef(engine=eng, idx=2)
cmd0 = Command(engine=eng, gate=Allocate, qubits=([qb1],))
cmd1 = Command(engine=eng, gate=Measure, qubits=([qb1],), controls=[],
tags=[LogicalQubitIDTag(2)])
with pytest.raises(NotYetMeasuredError):
int(qb1)
with pytest.raises(NotYetMeasuredError):
int(qb2)
eng.send([cmd0, cmd1])
eng.flush()
with pytest.raises(NotYetMeasuredError):
int(qb1)
assert int(qb2) == 0
def test_cannot_reallocate_same_qubit():
engine = MainEngine(
Simulator(),
engine_list=[BoundedQubitMapper(1)],
verbose=True,
)
qureg = engine.allocate_qubit()
qubit = qureg[0]
qubit_id = qubit.id
with pytest.raises(RuntimeError) as excinfo:
allocate_cmd = Command(
engine=engine,
gate=AllocateQubitGate(),
qubits=([WeakQubitRef(engine=engine, idx=qubit_id)], ),
tags=[LogicalQubitIDTag(qubit_id)],
)
engine.send([allocate_cmd])
assert str(excinfo.value) == "Qubit with id 0 has already been allocated!"
def test_cannot_deallocate_same_qubit():
mapper = BoundedQubitMapper(1)
engine = MainEngine(
Simulator(),
engine_list=[mapper],
verbose=True,
)
qureg = engine.allocate_qubit()
qubit_id = qureg[0].id
engine.deallocate_qubit(qureg[0])
with pytest.raises(RuntimeError) as excinfo:
deallocate_cmd = Command(
engine=engine,
gate=DeallocateQubitGate(),
qubits=([WeakQubitRef(engine=engine, idx=qubit_id)], ),
tags=[LogicalQubitIDTag(qubit_id)],
)
engine.send([deallocate_cmd])
assert str(excinfo.value
) == "Cannot deallocate a qubit that is not already allocated!"
def test_cannot_deallocate_unknown_qubit():
engine = MainEngine(
Simulator(),
engine_list=[BoundedQubitMapper(1)],
verbose=True,
)
qureg = engine.allocate_qubit()
with pytest.raises(RuntimeError) as excinfo:
deallocate_cmd = Command(
engine=engine,
gate=DeallocateQubitGate(),
qubits=([WeakQubitRef(engine=engine, idx=1)], ),
tags=[LogicalQubitIDTag(1)],
)
engine.send([deallocate_cmd])
assert str(excinfo.value
) == "Cannot deallocate a qubit that is not already allocated!"
# but we can still deallocate an already allocated one
engine.deallocate_qubit(qureg[0])
del qureg
del engine
def test_unitary_measure_mapped_qubit():
eng = MainEngine(UnitarySimulator())
qb1 = WeakQubitRef(engine=eng, idx=1)
qb2 = WeakQubitRef(engine=eng, idx=2)
cmd0 = Command(engine=eng, gate=Allocate, qubits=([qb1], ))
cmd1 = Command(engine=eng, gate=X, qubits=([qb1], ))
cmd2 = Command(
engine=eng,
gate=Measure,
qubits=([qb1], ),
controls=[],
tags=[LogicalQubitIDTag(2)],
)
with pytest.raises(NotYetMeasuredError):
int(qb1)
with pytest.raises(NotYetMeasuredError):
int(qb2)
eng.send([cmd0, cmd1])
eng.flush()
eng.send([cmd2])
with pytest.raises(NotYetMeasuredError):
int(qb1)
assert int(qb2) == 1
