All k-qubit reduced density matrices of an n-qubit state can be reconstructed from e^{O(k)} log^2(n) rounds of parallel product measurements using perfect hash families.
Quantum spintronics: en- gineering and manipulating atom-like spins in semicon- ductors
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Quantum Overlapping Tomography
All k-qubit reduced density matrices of an n-qubit state can be reconstructed from e^{O(k)} log^2(n) rounds of parallel product measurements using perfect hash families.