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- W2782034135 abstract "Out-of-time-ordered (OTO) correlators have developed into a central concept quantifying quantum information transport, information scrambling and quantum chaos. In this work we show that such OTO correlator can also be used to dynamically detect equilibrium as well as nonequilibrium phase transitions. We study OTO correlators of an order parameter around quantum critical points both in equilibrium and after a quantum quench by focusing on variants of transverse field Ising models, including the integrable one as well as non-integrable and long-range extensions. We find that the asymptotic long-time value of the OTO correlator signals the equilibrium critical points and ordered phases, and can serve as a putative order parameter for a dynamical quantum phase transition. This also implies that the late time value of the OTO commutator of the order parameter reaches a sizable value in the disordered phase even in the presence of well defined quasiparticles, in much the same way as is expected in chaotic systems. We discuss how our findings can be observed in current experiments of trapped ions or Rydberg atoms." @default.
- W2782034135 created "2018-01-12" @default.
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- W2782034135 date "2018-01-05" @default.
- W2782034135 modified "2023-09-27" @default.
- W2782034135 title "Detecting equilibrium and dynamical quantum phase transitions via out-of-time-ordered correlators" @default.
- W2782034135 hasPublicationYear "2018" @default.
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