Out-of-time-ordered correlators of mean-field bosons via Bogoliubov theory

• URL: http://arxiv.org/abs/2312.01736v2
• Date: Thu, 02 Jan 2025 13:27:49 GMT
• Title: Out-of-time-ordered correlators of mean-field bosons via Bogoliubov theory
• Authors: Marius Lemm, Simone Rademacher,
• Abstract summary: We show a new problem in nonlinear dispersive PDE with implications for quantum many-body chaos. Our finding spotlights a new problem in nonlinear dispersive PDE with implications for quantum many-body chaos.
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• Abstract: Quantum many-body chaos concerns the scrambling of quantum information among large numbers of degrees of freedom. It rests on the prediction that out-of-time-ordered correlators (OTOCs) of the form $\langle [A(t),B]^2\rangle$ can be connected to classical symplectic dynamics. We rigorously prove a variant of this correspondence principle for mean-field bosons. We show that the $N\to\infty$ limit of the OTOC $\langle [A(t),B]^2\rangle$ is explicitly given by a suitable symplectic Bogoliubov dynamics. In practical terms, we describe the dynamical build-up of many-body entanglement between a particle and the whole system by an explicit nonlinear PDE on $L^2(\mathbb{R}^3) \oplus L^2(\mathbb{R}^3)$. For higher-order correlators, we obtain an out-of-time-ordered analog of the Wick rule. The proof uses Bogoliubov theory. Our finding spotlights a new problem in nonlinear dispersive PDE with implications for quantum many-body chaos.

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