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arXiv · 2412.17706

Lindblad engineering for quantum Gibbs state preparation under the eigenstate thermalization hypothesis

Eric Brunner·Luuk Coopmans·Gabriel Matos·Matthias Rosenkranz·Frederic Sauvage·Yuta Kikuchi
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Abstract

Building upon recent progress in Lindblad engineering for quantum Gibbs state preparation algorithms, we propose a simplified protocol that is shown to be efficient under the eigenstate thermalization hypothesis (ETH). The ETH reduces circuit overheads of the Lindblad simulation algorithm and ensures a fast convergence toward the target Gibbs state. Moreover, we show that the realized Lindblad dynamics exhibits an inherent resilience against stochastic noise, opening up the path to a first demonstration on quantum computers. We complement our claims with numerical studies of the algorithm's convergence in various regimes of the mixed-field Ising model. In line with our predictions, we observe a mixing time scaling polynomially with system size when the ETH is satisfied. In addition, we assess the impact of algorithmic and hardware-induced errors on the algorithm's performance by carrying out quantum circuit simulations of our Lindblad simulation protocol with a local depolarizing noise model. This work bridges the gap between recent theoretical advances in dissipative Gibbs state preparation algorithms and their eventual quantum hardware implementation.

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Eric Brunner, Luuk Coopmans, Gabriel Matos, Matthias Rosenkranz, Frederic Sauvage, Yuta Kikuchi. 2024-12-23. Lindblad engineering for quantum Gibbs state preparation under the eigenstate thermalization hypothesis. https://doi.org/10.22331/q-2025-08-29-1843

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