Investigation: How many qubits can we scale up to

[Zhaoyilunnn]

When using logarithmic coordinates, the execution time scales linearly even beyond memory limit. However, we don't know whether and when the performance will degrade.

To investigate.

1. Fix the memory consumption, i.e., num_primary is fixed. In create the number of qubits.
2. Profiling the system-level performance of IO system. Break down the IO time into software (file-system) and hardware (device data transmission).