Ismail

### What is the expected behavior? Exactly as was done for Issue #793 in PR #794 should be done for: def get_subsystem_density_matrix(statevector, trace_systems)

Create a new branch to collect suggested improvements

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Let's create a new branch: pedagogically_improved to collect improvements.

Bayesian Framework for Quantum Algorithms in Qiskit: Principled Computing Amidst Noise

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  # Abstract Bayesian Inference is a powerful tool for handling noise and uncertainty while learning from data. It leverages well-defined parameterized models (theory) of the system under study...