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- W4311191180 abstract "We introduce a family of quantum R'enyi fidelities and discuss their symmetry resolution. We express the symmetry-resolved fidelities as Fourier transforms of charged fidelities, for which we derive exact formulas for fermionic Gaussian states. These results also yield a formula for the total fidelities of fermionic Gaussian states, which we expect to have applications beyond the scope of this paper. We investigate the total and symmetry-resolved fidelities in the XX spin chain and focus on (i) fidelities between thermal states and (ii) fidelities between reduced density matrices at zero temperature. Both thermal and reduced fidelities can detect the quantum phase transition of the XX spin chain. Moreover, we argue that symmetry-resolved fidelities are sensitive to the inner structure of the states. In particular, they can detect the phase transition through the reorganization of the charge sectors at the critical point. This a main feature of symmetry-resolved fidelities which we expect to be general. We also highlight that reduced fidelities can detect quantum phase transitions in the thermodynamic limit." @default.
- W4311191180 created "2022-12-24" @default.
- W4311191180 creator A5031620542 @default.
- W4311191180 date "2022-12-02" @default.
- W4311191180 modified "2023-10-03" @default.
- W4311191180 title "Symmetry-resolved Rényi fidelities and quantum phase transitions" @default.
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