For diffusion QST at 3 qubits, the Bloch representation reaches 0.907 fidelity while Hermitian direct reaches 0.394, reversing the 2-qubit ranking and showing that local conditioning alone does not predict reconstruction quality.
Parameterized quantum circuits as machine learning models.Quantum Science and Technology, 4(4): 043001, 2019
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A Design Space Study of Density Matrix Parameterizations for Diffusion-Based Quantum State Tomography
For diffusion QST at 3 qubits, the Bloch representation reaches 0.907 fidelity while Hermitian direct reaches 0.394, reversing the 2-qubit ranking and showing that local conditioning alone does not predict reconstruction quality.