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- W4308482733 abstract "The commutator $[x(t),p]$ in an inverted harmonic oscillator (IHO) in one-dimensional quantum mechanics exhibits remarkable properties. It reduces to a c-number and does not show any quantum fluctuations for arbitrary states. Related to this nature, the quantum Lyapunov exponent computed through the out-of-time-order correlator (OTOC) $⟨[x(t),p{]}^{2}⟩$ precisely agrees with the classical one. Hence, the OTOC may be regarded as an ideal indicator of the butterfly effect in the IHO. Since IHOs are ubiquitous in physics, these properties of the commutator $[x(t),p]$ and the OTOCs might be seen in various situations, too. In order to clarify this point, as a first step, we investigate OTOCs in one-dimensional quantum mechanics with polynomial potentials, which exhibit butterfly effects around the peak of the potential in classical mechanics. We find two situations in which the OTOCs show exponential growth reproducing the classical Lyapunov exponent of the peak. The first one, which is obvious, is using a suitably localized wave packet near the peak, and the second one is taking a limit akin to the large-$N$ limit in the noncritical string theories." @default.
- W4308482733 created "2022-11-12" @default.
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- W4308482733 date "2022-11-03" @default.
- W4308482733 modified "2023-10-03" @default.
- W4308482733 title "Extracting classical Lyapunov exponent from one-dimensional quantum mechanics" @default.
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- W4308482733 doi "https://doi.org/10.1103/physrevd.106.106001" @default.
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