Enhanced Many-Body Quantum Scars from the Non-Hermitian Fock Skin Effect
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 nonergodic states in generic open quantum systems.
- Publication:
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Physical Review Letters
- Pub Date:
- November 2024
- DOI:
- arXiv:
- arXiv:2403.02395
- Bibcode:
- 2024PhRvL.133u6601S
- Keywords:
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- Condensed Matter and Materials;
- Condensed Matter - Quantum Gases;
- Quantum Physics
- E-Print:
- 20 pages and 16 figures, including new quantum simulation results