Simulation test cases for memory error

[Naphann]

In order to be confident that QuISP is performing correctly when the code base changes.

We need a way to test memory error at the simulation level in addition to unit tests. Or add unit tests to include the time element.

For unit test

1. we want to test single qubit error probability vector after varying period of time.

For simulation we need

1. Sharing a link-level base Bell pairs without purification with perfect channel and 100% BSA efficiency.
2. varying channel length (to indirectly increase waiting time).
3. Tomography on the state
4. varying transition matrix (error rate per unit time).