As the number of qubits grows, the probability distribution of coarse-grained states from imperfect measurements concentrates sharply around the maximally mixed state.
Heisenberg,Physics and Beyond: Encounters and Conversations, World Perspectives, Vol
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Detecting quantum many-body states with imperfect measuring devices
As the number of qubits grows, the probability distribution of coarse-grained states from imperfect measurements concentrates sharply around the maximally mixed state.