While non-Hermitian Hamiltonians enable exotic dynamical phenomena, implementing their nonunitary time evolution on near-term quantum devices remains challenging. We propose a hardware-friendly protocol that simulates non-Hermitian dynamics without continuous monitoring. Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) evolution via classical Gaussian white-noise averaging and to subsequently cancel the quantum-jump contribution at the level of the measured observable using stochastic quantum error mitigation (QEM). The scheme requires no ancillas or controlled time-evolution, while the mitigation layer uses only single-qubit operations. We validate the method through numerical simulations of a model with asymmetric hopping, interaction, and disorder. Our work provides a programmable and ancilla-free framework investigating exotic dynamics that are not completely-positive and trace-preserving using QEM.
@article{arxiv.2602.21879,
title = {Quantum Error Mitigation Simulates General Non-Hermitian Dynamics},
author = {Hiroki Kuji and Suguru Endo and Tetsuro Nikuni and Ryusuke Hamazaki and Yuichiro Matsuzaki},
journal= {arXiv preprint arXiv:2602.21879},
year = {2026}
}