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Preserve stim.CircuitRepeatBlock tags #183

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Preserve stim.CircuitRepeatBlock tags #183

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12 changes: 10 additions & 2 deletions src/tsim/circuit.py
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Original file line number Diff line number Diff line change
Expand Up @@ -555,7 +555,11 @@ def strip(circuit: stim.Circuit) -> stim.Circuit:
for instr in circuit:
if isinstance(instr, stim.CircuitRepeatBlock):
stripped = strip(instr.body_copy())
result.append(stim.CircuitRepeatBlock(instr.repeat_count, stripped))
result.append(
stim.CircuitRepeatBlock(
instr.repeat_count, stripped, tag=instr.tag
)
)
continue
if instr.name in ["OBSERVABLE_INCLUDE", "DETECTOR"]:
continue
Expand Down Expand Up @@ -881,7 +885,11 @@ def fix_tags(circuit: stim.Circuit) -> stim.Circuit:
for instr in circuit:
if isinstance(instr, stim.CircuitRepeatBlock):
fixed = fix_tags(instr.body_copy())
result.append(stim.CircuitRepeatBlock(instr.repeat_count, fixed))
result.append(
stim.CircuitRepeatBlock(
instr.repeat_count, fixed, tag=instr.tag
)
)
continue

name = instr.name
Expand Down
4 changes: 3 additions & 1 deletion src/tsim/utils/clifford.py
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Expand Up @@ -157,7 +157,9 @@ def expand_clifford_rotations(source: stim.Circuit) -> stim.Circuit:
if isinstance(instr, stim.CircuitRepeatBlock):
out.append(
stim.CircuitRepeatBlock(
instr.repeat_count, expand_clifford_rotations(instr.body_copy())
instr.repeat_count,
expand_clifford_rotations(instr.body_copy()),
tag=instr.tag,
)
)
continue
Expand Down
4 changes: 3 additions & 1 deletion src/tsim/utils/diagram.py
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Original file line number Diff line number Diff line change
Expand Up @@ -383,7 +383,9 @@ def _replace_tagged_gates(
if isinstance(instr, stim.CircuitRepeatBlock):
modified_body = _replace_tagged_gates(instr.body_copy(), replace_dict)
modified_circ.append(
stim.CircuitRepeatBlock(instr.repeat_count, modified_body)
stim.CircuitRepeatBlock(
instr.repeat_count, modified_body, tag=instr.tag
)
)
continue

Expand Down
14 changes: 14 additions & 0 deletions test/unit/test_circuit.py
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Original file line number Diff line number Diff line change
Expand Up @@ -754,6 +754,20 @@ def test_stim_circuit_repeat_block_preserves_non_clifford():
assert block.repeat_count == 2


def test_stim_circuit_preserves_repeat_block_tags():
"""Tags on REPEAT blocks survive the round-trip through stim_circuit."""
c = Circuit(
"REPEAT[outer] 3 {\n H 0\n REPEAT[inner] 2 {\n CX 0 1\n }\n}"
)
stim_c = c.stim_circuit
outer = stim_c[0]
assert isinstance(outer, stim.CircuitRepeatBlock)
assert outer.tag == "outer"
inner = outer.body_copy()[-1]
assert isinstance(inner, stim.CircuitRepeatBlock)
assert inner.tag == "inner"


def test_get_graph():
"""Test get_graph returns a ZX graph."""
c = Circuit("H 0\nCNOT 0 1")
Expand Down