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- W4385292020 abstract "We study critical properties of the entanglement and charge-sharpening measurement-induced phase transitions in a non-unitary quantum circuit evolving with a U(1) conserved charge. Many critical properties appear distinct from the generic non-conserving case and percolation; however, upon interpreting the critical features as mixtures of both entanglement and charge-sharpening transitions, many critical features are brought within range of the generic case. Nonetheless, the multifractal properties of the entanglement transition remain distinct from the generic case without any symmetry, indicating a unique universality class due to the U(1) symmetry. We compute entanglement critical exponents and correlation functions via various ancilla measures, use a transfer matrix for multifractality, and compute correlators associated with charge sharpening to explain these findings. Through these correlators, we also find evidence consistent with the charge-sharpening transition being of the Berezinskii-Kosterlitz-Thouless type (including the predicted jump in stiffness), which simultaneously argues for a broad critical fan for this transition. As a result, attempts to measure critical properties in this system will see anomalously large exponents consistent with overlapping criticality." @default.
- W4385292020 created "2023-07-27" @default.
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- W4385292020 date "2023-07-24" @default.
- W4385292020 modified "2023-09-25" @default.
- W4385292020 title "Charge and Entanglement Criticality in a U(1)-Symmetric Hybrid Circuit of Qubits" @default.
- W4385292020 doi "https://doi.org/10.48550/arxiv.2307.13038" @default.
- W4385292020 hasPublicationYear "2023" @default.
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