Enhanced many-body quantum scars from the non-Hermitian Fock skin effect

• URL: http://arxiv.org/abs/2403.02395v2
• Date: Mon, 2 Sep 2024 04:01:03 GMT
• Title: Enhanced many-body quantum scars from the non-Hermitian Fock skin effect
• Authors: Ruizhe Shen, Fang Qin, Jean-Yves Desaules, Zlatko Papić, Ching Hua Lee,
• Abstract summary: We show that the so-called skin effect originating from non-Hermitian pumping can manifest as dynamical amplification within the Fock space. We propose an experimental realization of the non-Hermitian scar enhancement in a tilted Bose-Hubbard optical lattice with laser-induced loss. Our results show that the Fock skin effect provides a powerful tool for creating robust non-ergodic states in generic open quantum systems.
• Score: 3.3492229306776777
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: In contrast with extended Bloch waves, a single particle can become spatially localized due to the so-called skin effect originating from non-Hermitian pumping. Here we show that in kinetically-constrained many-body systems, the skin effect can instead manifest as dynamical amplification within the Fock space, beyond the intuitively expected and previously studied particle localization and clustering. We exemplify this non-Hermitian Fock skin effect in an asymmetric version of the PXP model and show that it gives rise to ergodicity-breaking eigenstates, the non-Hermitian analogs of quantum many-body scars. A distinguishing feature of these non-Hermitian scars is their enhanced robustness against external disorders. We propose an experimental realization of the non-Hermitian scar enhancement in a tilted Bose-Hubbard optical lattice with laser-induced loss. Additionally, we implement digital simulations of such scar enhancement on the IBM quantum processor. Our results show that the Fock skin effect provides a powerful tool for creating robust non-ergodic states in generic open quantum systems.

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