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Statistics of noninteracting many-body fermionic states: The question of a many-body mobility edge

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arxiv 2306.11692 v1 pith:2ZNPXJJN submitted 2023-06-20 cond-mat.dis-nn quant-ph

classification cond-mat.dis-nnquant-ph
keywords many-bodyfermionicnoninteractingedgemobilitysystemgenericinfinite-temperature
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abstract

In this work, we study the statistics of a generic noninteracting many-body fermionic system whose single-particle counterpart has a single-particle mobility edge (SPME). We first prove that the spectrum and the extensive conserved quantities follow the multivariate normal distribution with a vanishing standard deviation $\sim O(1/\sqrt L)$ in the thermodynamic limit, regardless of SPME. Consequently, the theorem rules out an infinite-temperature or high-temperature many-body mobility edge (MBME) for generic noninteracting fermionic systems. Further, we also prove that the spectrum of a fermionic many-body system with short-range interactions is qualitatively similar to that of a noninteracting many-body system up to the third-order moment. These results partially explain why neither short-range [1] nor long-range interacting systems exhibit an infinite-temperature MBME.

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  1. Model Inversion Attacks on Llama 3: Extracting PII from Large Language Models

    cs.LG 2025-07 reject novelty 2.0 of 10

    Simple prompts to Llama 3.2 1B produce text that resembles PII, but the paper does not establish that this text is memorized training data.

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