`[[]] * size` in qgather causes silent data corruption

[CardamaS99]

Description

File: netqmpi/sdk/primitives/collective/collective.py (line ~95)

Problem

received_qubits = [[]] * size

This creates size references to the same list object. Although assignment with = by index currently works, if .append() is used in the future, everything would be silently corrupted.

This is a dangerous anti-pattern in Python.

Solution

received_qubits = [[] for _ in range(size)]

Impact

• Severity: Critical
• Affects: qgather with multiple nodes