Related papers: Measurement-induced Lévy flights of quantum information

Measurement-induced Lévy flights of quantum information

URL: http://arxiv.org/abs/2501.12903v1
Date: Wed, 22 Jan 2025 14:29:13 GMT
Title: Measurement-induced Lévy flights of quantum information
Authors: Igor Poboiko, Marcin Szyniszewski, Christopher J. Turner, Igor V. Gornyi, Alexander D. Mirlin, Arijeet Pal,
Abstract summary: We explore a model of free fermions in one dimension subject to frustrated local measurements across adjacent sites. For maximal misalignment, superdiffusive behavior emerges from the vanishing of the measurement-induced quasiparticle decay rate. Our findings show how intricate fractal-scaling entanglement can be produced for local Hamiltonians.
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Abstract: We explore a model of free fermions in one dimension, subject to frustrated (non-commuting) local measurements across adjacent sites, which resolves the fermions into non-orthogonal orbitals, misaligned from the underlying lattice. For maximal misalignment, superdiffusive behavior emerges from the vanishing of the measurement-induced quasiparticle decay rate at one point in the Brillouin zone, which generates fractal-scaling entanglement entropy $S \propto \ell^{1/3}$ for a subsystem of length $\ell$. We derive an effective non-linear sigma model with long-range couplings responsible for L\'evy flights in entanglement propagation, which we confirm with large-scale numerical simulations. When the misalignment is reduced, the entanglement exhibits, with increasing $\ell$, consecutive regimes of superdiffusive, $S\propto \ell^{1/3}$, diffusive, $S\propto \ln \ell$, and localized, $S = \rm{const}$, behavior. Our findings show how intricate fractal-scaling entanglement can be produced for local Hamiltonians and measurements.

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