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Ignore operations on more than 10 qubits in drop_negligible_operations transformer #5386

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Merged
merged 3 commits into from
May 23, 2022
Merged

Ignore operations on more than 10 qubits in drop_negligible_operations transformer #5386

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d2ed9c3
Ignore operations on more than 10 qubits in drop_negligible_operation…
tanujkhattar May 21, 2022
8890251
Merge branch 'master' into fix_drop_negligible
CirqBot May 23, 2022
0c43e98
Assert same circuits
tanujkhattar May 23, 2022
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6 changes: 5 additions & 1 deletion cirq-core/cirq/transformers/drop_negligible_operations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,11 @@ def drop_negligible_operations(

def map_func(op: 'cirq.Operation', _: int) -> 'cirq.OP_TREE':
return (
op if protocols.is_measurement(op) or protocols.trace_distance_bound(op) > atol else []
op
if protocols.num_qubits(op) > 10
or protocols.is_measurement(op)
or protocols.trace_distance_bound(op) > atol
else []
)

return transformer_primitives.map_operations(
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10 changes: 10 additions & 0 deletions cirq-core/cirq/transformers/drop_negligible_operations_test.py
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Expand Up @@ -94,3 +94,13 @@ def test_recursively_runs_inside_circuit_ops_deep():
cirq.testing.assert_same_circuits(
cirq.drop_negligible_operations(c_orig, context=context, atol=0.001), c_expected
)


def test_ignores_large_ops():
qnum = 20
qubits = cirq.LineQubit.range(qnum)
subcircuit = cirq.FrozenCircuit(cirq.X.on_each(*qubits))
circuit = cirq.Circuit(
cirq.CircuitOperation(subcircuit).repeat(10), cirq.measure(*qubits, key='out')
)
assert cirq.drop_negligible_operations(circuit, context=cirq.TransformerContext(deep=True))