Bounded-Error Quantum Simulation via Hamiltonian and Lindbladian Learning

TL;DR

This paper introduces a rigorous framework for bounded-error quantum simulation that quantifies uncertainties in many-body observables, validated on trapped-ion systems, enabling reliable predictions beyond classical capabilities.

Contribution

It develops a general method combining Hamiltonian and Lindbladian learning with uncertainty propagation to provide quantifiable error bounds in quantum simulations.

Findings

Validated on trapped-ion quantum simulators with up to 51 ions.

Achieved quantitative agreement between models and experimental data within error bounds.

Established error bounds directly from experimental data without classical simulation.

Abstract

Analog Quantum Simulators offer a route to exploring strongly correlated many-body dynamics beyond classical computation, but their predictive power remains limited by the absence of quantitative error estimation. Establishing rigorous uncertainty bounds is essential for elevating such devices from qualitative demonstrations to quantitative scientific tools. Here we introduce a general framework for bounded-error quantum simulation, which provides predictions for many-body observables with experimentally quantifiable uncertainties. The approach combines Hamiltonian and Lindbladian Learning--a statistically rigorous inference of the coherent and dissipative generators governing the dynamics--with the propagation of their uncertainties into the simulated observables, yielding confidence bounds directly derived from experimental data. We demonstrate this framework on trapped-ion quantum simulators implementing long-range Ising interactions with up to 51 ions, and validate it where classical comparison is possible. We analyze error bounds on two levels. First, we learn an open-system model from experimental data collected in an initial time window of quench dynamics, simulate the corresponding master equation, and quantitatively verify consistency between theoretical predictions and measured dynamics at long times. Second, we establish error bounds directly from experimental measurements alone, without relying on classical simulation--crucial for entering regimes of quantum advantage. The learned models reproduce the experimental evolution within the predicted bounds, demonstrating quantitative reliability and internal consistency. Bounded-error quantum simulation provides a scalable foundation for trusted analog quantum computation, bridging the gap between experimental platforms and predictive many-body physics. The techniques presented here directly extend to digital quantum simulation.