Kardar--Parisi--Zhang density hydrodynamics in a coherent XXZ--ASEP Lindbladian
Abstract
Coherent interactions can generate quantum correlations without changing a stationary density current. Whether that current still determines long-wavelength transport is a dynamical question. We study an XXZ chain with asymmetric Lindblad hopping, whose stationary current has the asymmetric simple exclusion process (ASEP) form although its populations do not evolve autonomously. The current curvature and static susceptibility fix the leading Kardar--Parisi--Zhang (KPZ) length and amplitude without a fitted length or amplitude conversion factor. The density-visible Liouvillian spectrum, real-space spreading, and Fourier relaxation support KPZ scaling at the finite coherent couplings studied. Central and intermediate stationary density correlations are consistent with the Prähofer--Spohn profile at this microscopic scale, with resolved finite-time corrections. Reservoir-matched classical references quantify boundary effects, while symmetric hopping recovers diffusion and reduced asymmetry produces the expected crossover. These results connect an exact nonlinear current to the observed long-wavelength KPZ transport of the physical density in an interacting open quantum chain away from the isotropic Heisenberg point.
Related
- Kardar-Parisi-Zhang superdiffusion in chaotic quantum circuits
- Unified hydrodynamics for density and spin supersolids
- Relativistic viscous hydrodynamics in the Density Frame for heavy-ion collisions
- Coherent Bose-Einstein condensation with fluctuating density
- Near-optimal quantum simulation of lattice Lindbladian dynamics
BibTeX
@misc{liu2026kardarparisizhang,
title = {{Kardar--Parisi--Zhang density hydrodynamics in a coherent XXZ--ASEP Lindbladian}},
author = {Yansheng Liu and Daoguang Li and Kaixiang Lu and Mingdi Xu and Lei Pan},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06369},
eprint = {2611.06369},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06369},
}
RIS
TY - UNPB
TI - Kardar--Parisi--Zhang density hydrodynamics in a coherent XXZ--ASEP Lindbladian
AU - Yansheng Liu
AU - Daoguang Li
AU - Kaixiang Lu
AU - Mingdi Xu
AU - Lei Pan
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06369
UR - https://arxiv.org/abs/2611.06369
AB - Coherent interactions can generate quantum correlations without changing a stationary density current. Whether that current still determines long-wavelength transport is a dynamical question. We study an XXZ chain with asymmetric Lindblad hopping, whose stationary current has the asymmetric simple exclusion process (ASEP) form although its populations do not evolve autonomously. The current curvature and static susceptibility fix the leading Kardar--Parisi--Zhang (KPZ) length and amplitude without a fitted length or amplitude conversion factor. The density-visible Liouvillian spectrum, real-space spreading, and Fourier relaxation support KPZ scaling at the finite coherent couplings studied. Central and intermediate stationary density correlations are consistent with the Prähofer--Spohn profile at this microscopic scale, with resolved finite-time corrections. Reservoir-matched classical references quantify boundary effects, while symmetric hopping recovers diffusion and reduced asymmetry produces the expected crossover. These results connect an exact nonlinear current to the observed long-wavelength KPZ transport of the physical density in an interacting open quantum chain away from the isotropic Heisenberg point.
ER -