Quantum Error Mitigation Simulates General Non-Hermitian Dynamics

• URL: http://arxiv.org/abs/2602.21879v1
• Date: Wed, 25 Feb 2026 13:04:32 GMT
• Title: Quantum Error Mitigation Simulates General Non-Hermitian Dynamics
• Authors: Hiroki Kuji, Suguru Endo, Tetsuro Nikuni, Ryusuke Hamazaki, Yuichiro Matsuzaki,
• Abstract summary: We propose a hardware-friendly protocol that simulates non-Hermitian dynamics without continuous monitoring.<n>We use quantum error mitigation (QEM) to cancel the quantum-jump contribution at the level of the measured observable.<n>Our work provides a programmable and ancilla-free framework investigating exotic dynamics that are not completely-positive and trace-preserving.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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