shiavm006 opened a new pull request, #615:
URL: https://github.com/apache/mahout/pull/615
### Purpose
Fixes crash in Cirq backend when executing 0-qubit circuits with
measurements.
### Related Issues
issue related #608
### Changes Made
- Added guard in `execute_circuit()` to handle empty circuits before adding
measurements
- Returns Cirq-formatted result `[{0: shots}]` for 0-qubit case
- Prevents crash when `cirq.measure()` is called on empty qubit list
### Technical Details
The issue occurred at line 106 where
`circuit.append(cirq.measure(*circuit.all_qubits(), key="result"))` crashes on
empty circuits because `circuit.all_qubits()` returns an empty list.
This fix aligns with existing behavior in the main `QuMat` class (lines
92-97 in `qumat.py`) which already handles 0-qubit circuits. Moving this logic
to the backend makes it self-contained and robust.
### Breaking Changes
None. This is a bug fix that maintains existing behavior.
### Checklist
- [x] Code follows project style guidelines
- [x] Changes are minimal and focused on the issue
- [x] Implementation aligns with maintainer feedback
- [x] No breaking changes introduced
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