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leakage_detection_test.py
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# Copyright Quantinuum
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from collections import Counter
from collections.abc import Sequence
from typing import cast
import pytest
from pytket import Bit, Circuit, OpType, Qubit # type: ignore
from pytket.backends.backendresult import BackendResult
from pytket.extensions.quantinuum.backends.leakage_gadget import (
LEAKAGE_DETECTION_BIT_NAME_,
LEAKAGE_DETECTION_QUBIT_NAME_,
get_detection_circuit,
get_leakage_gadget_circuit,
prune_shots_detected_as_leaky,
)
from pytket.utils.outcomearray import OutcomeArray
def test_postselection_circuits_1qb_task_gen() -> None:
comparison_circuit: Circuit = Circuit(1, 1)
lg_qb = Qubit(LEAKAGE_DETECTION_QUBIT_NAME_, 0)
lg_b = Bit(LEAKAGE_DETECTION_BIT_NAME_, 0)
comparison_circuit.add_qubit(lg_qb)
comparison_circuit.add_bit(lg_b)
comparison_circuit.add_gate(OpType.Reset, [lg_qb])
comparison_circuit.X(lg_qb).H(0)
comparison_circuit.add_barrier([Qubit(0), lg_qb])
comparison_circuit.H(lg_qb).ZZMax(lg_qb, Qubit(0))
comparison_circuit.add_barrier([Qubit(0), lg_qb])
comparison_circuit.ZZMax(lg_qb, Qubit(0)).H(lg_qb).Z(0)
comparison_circuit.add_barrier([Qubit(0), lg_qb])
comparison_circuit.Measure(0, 0).Measure(lg_qb, lg_b)
assert comparison_circuit == get_detection_circuit(
Circuit(1, 1).H(0).Measure(0, 0), 2
)
def test_postselection_circuits_2qb_2_spare_task_gen() -> None:
comparison_circuit = Circuit(2, 2)
lg_qb0 = Qubit(LEAKAGE_DETECTION_QUBIT_NAME_, 0)
lg_b0 = Bit(LEAKAGE_DETECTION_BIT_NAME_, 0)
lg_qb1 = Qubit(LEAKAGE_DETECTION_QUBIT_NAME_, 1)
lg_b1 = Bit(LEAKAGE_DETECTION_BIT_NAME_, 1)
comparison_circuit.add_qubit(lg_qb0)
comparison_circuit.add_bit(lg_b0)
comparison_circuit.add_qubit(lg_qb1)
comparison_circuit.add_bit(lg_b1)
comparison_circuit.add_gate(OpType.Reset, [lg_qb0])
comparison_circuit.add_gate(OpType.Reset, [lg_qb1])
comparison_circuit.X(lg_qb0).X(lg_qb1).H(0).CZ(0, 1)
comparison_circuit.add_barrier([Qubit(0), lg_qb0])
comparison_circuit.add_barrier([Qubit(1), lg_qb1])
comparison_circuit.H(lg_qb0).H(lg_qb1).ZZMax(lg_qb0, Qubit(0)).ZZMax(
lg_qb1, Qubit(1)
)
comparison_circuit.add_barrier([Qubit(0), lg_qb0])
comparison_circuit.add_barrier([Qubit(1), lg_qb1])
comparison_circuit.ZZMax(lg_qb0, Qubit(0)).ZZMax(lg_qb1, Qubit(1))
comparison_circuit.H(lg_qb0).H(lg_qb1).Z(0).Z(1)
comparison_circuit.add_barrier([Qubit(0), lg_qb0])
comparison_circuit.add_barrier([Qubit(1), lg_qb1])
comparison_circuit.Measure(0, 0).Measure(1, 1).Measure(lg_qb0, lg_b0).Measure(
lg_qb1, lg_b1
)
assert comparison_circuit == get_detection_circuit(
Circuit(2, 2).H(0).CZ(0, 1).Measure(0, 0).Measure(1, 1), 4
)
def test_postselection_circuits_2qb_1_spare_task_gen() -> None:
comparison_circuit = Circuit(2, 2)
lg_qb = Qubit(LEAKAGE_DETECTION_QUBIT_NAME_, 0)
lg_b0 = Bit(LEAKAGE_DETECTION_BIT_NAME_, 0)
lg_b1 = Bit(LEAKAGE_DETECTION_BIT_NAME_, 1)
comparison_circuit.add_qubit(lg_qb)
comparison_circuit.add_bit(lg_b0)
comparison_circuit.add_bit(lg_b1)
comparison_circuit.add_gate(OpType.Reset, [lg_qb])
comparison_circuit.X(lg_qb).H(0).CZ(0, 1)
comparison_circuit.add_barrier([Qubit(0), lg_qb])
comparison_circuit.H(lg_qb).ZZMax(lg_qb, Qubit(0))
comparison_circuit.add_barrier([Qubit(0), lg_qb])
comparison_circuit.ZZMax(lg_qb, Qubit(0)).H(lg_qb).Z(0)
comparison_circuit.add_barrier([Qubit(0), lg_qb])
comparison_circuit.Measure(0, 0).Measure(lg_qb, lg_b0)
# with reuse of pre-measured qubits, this will now use Qubit 0 from the circuit
comparison_circuit.add_gate(OpType.Reset, [Qubit(0)])
comparison_circuit.X(Qubit(0))
comparison_circuit.add_barrier([Qubit(1), Qubit(0)])
comparison_circuit.H(Qubit(0)).ZZMax(Qubit(0), Qubit(1))
comparison_circuit.add_barrier([Qubit(1), Qubit(0)])
comparison_circuit.ZZMax(Qubit(0), Qubit(1)).H(Qubit(0)).Z(1)
comparison_circuit.add_barrier([Qubit(1), Qubit(0)])
comparison_circuit.Measure(1, 1).Measure(Qubit(0), lg_b1)
assert comparison_circuit == get_detection_circuit(
Circuit(2, 2).H(0).CZ(0, 1).Measure(0, 0).Measure(1, 1), 3
)
def test_postselection_no_qubits() -> None:
with pytest.raises(ValueError):
get_detection_circuit(Circuit(0), 1)
def test_postselection_not_enough_device_qubits_0() -> None:
comparison_circuit = Circuit(2, 2)
comparison_circuit.CX(0, 1).Measure(0, 0)
comparison_circuit.append(
get_leakage_gadget_circuit(
Qubit(1), Qubit(0), Bit(LEAKAGE_DETECTION_BIT_NAME_, 0)
)
)
comparison_circuit.Measure(1, 1)
assert comparison_circuit == get_detection_circuit(
Circuit(2, 2).CX(0, 1).measure_all(), 2
)
def test_postselection_not_enough_device_qubits_1() -> None:
comparison_circuit = Circuit(4, 4)
comparison_circuit.CX(0, 1).Measure(0, 0).CX(1, 2)
comparison_circuit.CX(2, 3)
comparison_circuit.append(
get_leakage_gadget_circuit(
Qubit(1), Qubit(0), Bit(LEAKAGE_DETECTION_BIT_NAME_, 0)
)
)
comparison_circuit.Measure(1, 1)
comparison_circuit.append(
get_leakage_gadget_circuit(
Qubit(2), Qubit(1), Bit(LEAKAGE_DETECTION_BIT_NAME_, 1)
)
)
comparison_circuit.Measure(2, 2)
comparison_circuit.append(
get_leakage_gadget_circuit(
Qubit(3), Qubit(2), Bit(LEAKAGE_DETECTION_BIT_NAME_, 2)
)
)
comparison_circuit.Measure(3, 3)
assert comparison_circuit == get_detection_circuit(
Circuit(4, 4).CX(0, 1).CX(1, 2).CX(2, 3).measure_all(), 4
)
def test_postselection_existing_qubit() -> None:
lg_qb = Qubit(LEAKAGE_DETECTION_QUBIT_NAME_, 0)
c = Circuit(1, 2).X(0)
c.add_qubit(lg_qb)
c.X(lg_qb)
c.Measure(0, 0)
c.Measure(lg_qb, Bit(1))
with pytest.raises(ValueError):
get_detection_circuit(c, 2)
def test_postselection_existing_bit() -> None:
lg_b = Bit(LEAKAGE_DETECTION_BIT_NAME_, 0)
c = Circuit(2, 1).CX(0, 1)
c.add_bit(lg_b)
c.Measure(0, 0)
c.Measure(Qubit(1), lg_b)
with pytest.raises(ValueError):
get_detection_circuit(c, 2)
def test_postselection_discard_0() -> None:
counter_dict = {(0, 0): 100, (0, 1): 75, (1, 0): 50, (1, 1): 25}
counts = Counter(
{OutcomeArray.from_readouts([key]): val for key, val in counter_dict.items()}
)
discard_result = prune_shots_detected_as_leaky(
BackendResult(
counts=counts,
c_bits=cast(Sequence[Bit], [Bit(0), Bit(LEAKAGE_DETECTION_BIT_NAME_, 0)]),
)
).get_counts()
assert discard_result[(0,)] == 100
assert discard_result[(1,)] == 50
def test_postselection_discard_1() -> None:
raw_readouts = (
[[0, 0, 0, 0]] * 100
+ [[0, 1, 0, 0]] * 75
+ [[0, 1, 0, 1]] * 50
+ [[1, 0, 1, 0]] * 33
)
outcomes = OutcomeArray.from_readouts(raw_readouts)
backres_shots = BackendResult(
shots=outcomes,
c_bits=[
Bit(3),
Bit(LEAKAGE_DETECTION_BIT_NAME_, 23),
Bit("a", 7),
Bit(LEAKAGE_DETECTION_BIT_NAME_, 3),
],
)
discard_result = prune_shots_detected_as_leaky(backres_shots).get_counts()
assert discard_result[(0, 0)] == 100
assert discard_result[(1, 1)] == 33
if __name__ == "__main__":
test_postselection_circuits_1qb_task_gen()
test_postselection_circuits_2qb_2_spare_task_gen()
test_postselection_circuits_2qb_1_spare_task_gen()
test_postselection_discard_0()
test_postselection_discard_1()
test_postselection_existing_qubit()
test_postselection_existing_bit()
test_postselection_no_qubits()
test_postselection_not_enough_device_qubits_0()
test_postselection_not_enough_device_qubits_1()