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Avoid inefficient list construction in qubit_tapering_from_stabilizer.py #1262

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Avoid inefficient list construction in qubit_tapering_from_stabilizer.py #1262

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1161998
⚡ optimize list construction in qubit_tapering_from_stabilizer.py
mhucka Apr 10, 2026
9369571
Merge branch 'main' into performance-optimization-list-append-1514282…
mhucka Apr 10, 2026
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16 changes: 8 additions & 8 deletions src/openfermion/transforms/repconversions/qubit_tapering_from_stabilizer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -168,7 +168,7 @@ def _reduce_terms(terms, stabilizer_list, manual_input, fixed_positions):
# Find first position non-fixed position with non-trivial Pauli.
for qubit_pauli in selected_stab:
if qubit_pauli[0] not in fixed_positions:
fixed_positions += [qubit_pauli[0]]
fixed_positions.append(qubit_pauli[0])
fixed_op = qubit_pauli[1]
break

Expand All @@ -191,11 +191,11 @@ def _reduce_terms(terms, stabilizer_list, manual_input, fixed_positions):
)
updated_stabilizers = []
for update_stab in stabilizer_list[1:]:
updated_stabilizers += [
updated_stabilizers.append(
fix_single_term(
update_stab, fixed_positions[i], fixed_op, other_op, stabilizer_list[0]
)
]
)

# Update terms and stabilizer list.
terms = new_terms
Expand Down Expand Up @@ -243,7 +243,7 @@ def _reduce_terms_keep_length(terms, stabilizer_list, manual_input, fixed_positi
# Finds qubit position and its Pauli.
for qubit_pauli in selected_stab:
if qubit_pauli[0] not in fixed_positions:
fixed_positions += [qubit_pauli[0]]
fixed_positions.append(qubit_pauli[0])
fixed_op = qubit_pauli[1]
break
else:
Expand All @@ -261,15 +261,15 @@ def _reduce_terms_keep_length(terms, stabilizer_list, manual_input, fixed_positi
new_list = []
updated_stabilizers = []
for y in term_list:
new_list += [
new_list.append(
fix_single_term(y, fixed_positions[i], fixed_op, other_op, stabilizer_list[0])
]
)
for update_stab in stabilizer_list[1:]:
updated_stabilizers += [
updated_stabilizers.append(
fix_single_term(
update_stab, fixed_positions[i], fixed_op, other_op, stabilizer_list[0]
)
]
)
term_list = new_list
stabilizer_list = updated_stabilizers

Expand Down
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