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- W4280491525 abstract "The sign structure of quantum states is closely connected to quantum phases of matter, yet detecting such fine-grained properties of amplitudes is subtle. Here we employ as a diagnostic measurement-induced entanglement (MIE): the average entanglement generated between two parties after measuring the rest of the system. We propose that for a sign-free state, the MIE upon measuring in the sign-free basis decays no slower than correlations in the state before measurement. Concretely, we prove that MIE is upper bounded by mutual information for sign-free stabilizer states (essentially CSS codes), which establishes a bound between scaling dimensions of conformal field theories describing measurement-induced critical points in stabilizer systems. We also show that for sign-free qubit wavefunctions, MIE between two qubits is upper bounded by a simple two-point correlation function, and we verify our proposal in several critical ground states of one-dimensional systems, including the transverse field and tri-critical Ising models. In contrast, for states with sign structure, such bounds can be violated, as we illustrate in critical hybrid circuits involving both Haar or Clifford random unitaries and measurements, and gapless symmetry-protected topological states." @default.
- W4280491525 created "2022-05-22" @default.
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- W4280491525 date "2022-05-11" @default.
- W4280491525 modified "2023-09-23" @default.
- W4280491525 title "Probing sign structure using measurement-induced entanglement" @default.
- W4280491525 doi "https://doi.org/10.48550/arxiv.2205.05692" @default.
- W4280491525 hasPublicationYear "2022" @default.
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