def test_Memory_expire():
class FakeProtocol(EntanglementProtocol):
def __init__(self, name):
super().__init__(None, name)
self.is_expire = False
def set_others(self, other: "EntanglementProtocol") -> None:
pass
def start(self) -> None:
pass
def is_ready(self) -> bool:
pass
def memory_expire(self, memory) -> None:
self.is_expire = True
def received_message(self, src: str, msg: "Message"):
pass
def expire(self, memory: Memory):
self.memory_expire(memory)
tl = Timeline()
mem = Memory("mem",
tl,
fidelity=1,
frequency=0,
efficiency=1,
coherence_time=-1,
wavelength=500)
parent = DumbParent(mem)
protocol = FakeProtocol("upper_protocol")
mem.attach(protocol)
mem.update_state([math.sqrt(1 / 2), math.sqrt(1 / 2)])
entangled_memory = {"node_id": "node", "memo_id": 0}
mem.entangled_memory = entangled_memory
# expire when the protocol controls memory
mem.detach(parent)
assert len(parent.pop_log) == 0 and protocol.is_expire is False
mem.expire()
assert (tl.quantum_manager.get(mem.qstate_key).state == np.array(
[1, 0])).all # check if collapsed to |0> state
assert mem.entangled_memory == {"node_id": None, "memo_id": None}
assert len(parent.pop_log) == 0 and protocol.is_expire is True
# expire when the resource manager controls memory
mem.attach(parent)
mem.detach(protocol)
mem.update_state([math.sqrt(1 / 2), math.sqrt(1 / 2)])
entangled_memory = {"node_id": "node", "memo_id": 0}
mem.entangled_memory = entangled_memory
mem.expire()
assert len(parent.pop_log) == 1
def create_scenario(state1, state2, seed):
tl = Timeline()
tl.seed(seed)
a1 = FakeNode("a1", tl)
a2 = FakeNode("a2", tl)
a3 = FakeNode("a3", tl)
cc0 = ClassicalChannel("a2-a1", tl, 0, 1e5)
cc1 = ClassicalChannel("a2-a3", tl, 0, 1e5)
cc0.set_ends(a2, a1)
cc1.set_ends(a2, a3)
tl.init()
memo1 = Memory("a1.0", timeline=tl, fidelity=0.9, frequency=0, efficiency=1, coherence_time=1, wavelength=500)
memo2 = Memory("a2.0", tl, 0.9, 0, 1, 1, 500)
memo3 = Memory("a2.1", tl, 0.9, 0, 1, 1, 500)
memo4 = Memory("a3.0", tl, 0.9, 0, 1, 1, 500)
memo1.fidelity = memo2.fidelity = memo3.fidelity = memo4.fidelity = 1
memo1.entangled_memory = {'node_id': 'a2', 'memo_id': memo2.name}
memo2.entangled_memory = {'node_id': 'a1', 'memo_id': memo1.name}
memo3.entangled_memory = {'node_id': 'a3', 'memo_id': memo4.name}
memo4.entangled_memory = {'node_id': 'a2', 'memo_id': memo3.name}
tl.quantum_manager.set([memo1.qstate_key, memo2.qstate_key], state1)
tl.quantum_manager.set([memo3.qstate_key, memo4.qstate_key], state2)
es1 = EntanglementSwappingB(a1, "a1.ESb0", memo1)
a1.protocols.append(es1)
es2 = EntanglementSwappingA(a2, "a2.ESa0", memo2, memo3)
a2.protocols.append(es2)
es3 = EntanglementSwappingB(a3, "a3.ESb1", memo4)
a3.protocols.append(es3)
es1.set_others(es2)
es3.set_others(es2)
es2.set_others(es1)
es2.set_others(es3)
es2.start()
tl.run()
ket1, ket2, ket3, ket4 = map(tl.quantum_manager.get,
[memo1.qstate_key, memo2.qstate_key, memo3.qstate_key, memo4.qstate_key])
assert id(ket1) == id(ket4)
assert id(ket2) != id(ket3)
assert len(ket1.keys) == 2 and memo1.qstate_key in ket1.keys and memo4.qstate_key in ket1.keys
assert len(ket2.keys) == 1
assert memo2.entangled_memory == memo3.entangled_memory == {'node_id': None, 'memo_id': None}
assert memo1.entangled_memory["node_id"] == "a3" and memo4.entangled_memory["node_id"] == "a1"
assert a1.resource_manager.log[-1] == (memo1, "ENTANGLED")
assert a3.resource_manager.log[-1] == (memo4, "ENTANGLED")
return ket1, ket2, ket3, ket4, a3
def create_scenario(state1, state2, seed):
tl = Timeline()
tl.seed(seed)
a1 = FakeNode("a1", tl)
a2 = FakeNode("a2", tl)
cc0 = ClassicalChannel("cc0", tl, 0, 1e5)
cc1 = ClassicalChannel("cc1", tl, 0, 1e5)
cc0.delay = ONE_MILLISECOND
cc1.delay = ONE_MILLISECOND
cc0.set_ends(a1, a2)
cc1.set_ends(a2, a1)
kept1 = Memory('kept1', tl, fidelity=1, frequency=0, efficiency=1, coherence_time=1, wavelength=HALF_MICRON)
kept2 = Memory('kept2', tl, fidelity=1, frequency=0, efficiency=1, coherence_time=1, wavelength=HALF_MICRON)
meas1 = Memory('mea1', tl, fidelity=1, frequency=0, efficiency=1, coherence_time=1, wavelength=HALF_MICRON)
meas2 = Memory('mea2', tl, fidelity=1, frequency=0, efficiency=1, coherence_time=1, wavelength=HALF_MICRON)
tl.init()
tl.quantum_manager.set([kept1.qstate_key, kept2.qstate_key], state1)
tl.quantum_manager.set([meas1.qstate_key, meas2.qstate_key], state2)
kept1.entangled_memory = {'node_id': 'a2', 'memo_id': 'kept2'}
kept2.entangled_memory = {'node_id': 'a1', 'memo_id': 'kept1'}
meas1.entangled_memory = {'node_id': 'a2', 'memo_id': 'meas2'}
meas2.entangled_memory = {'node_id': 'a1', 'memo_id': 'meas1'}
kept1.fidelity = kept2.fidelity = meas1.fidelity = meas2.fidelity = 1
ep1 = BBPSSW(a1, "a1.ep1", kept1, meas1)
ep2 = BBPSSW(a2, "a2.ep2", kept2, meas2)
a1.protocols.append(ep1)
a2.protocols.append(ep2)
ep1.set_others(ep2)
ep2.set_others(ep1)
ep1.start()
ep2.start()
tl.run()
assert meas1.entangled_memory == meas2.entangled_memory == {'node_id': None, 'memo_id': None}
return tl, kept1, kept2, meas1, meas2, ep1, ep2