Quantum Maximum Entropy Inference and Hamiltonian Learning

• URL: http://arxiv.org/abs/2407.11473v1
• Date: Tue, 16 Jul 2024 08:11:34 GMT
• Title: Quantum Maximum Entropy Inference and Hamiltonian Learning
• Authors: Minbo Gao, Zhengfeng Ji, Fuchao Wei,
• Abstract summary: This work extends algorithms for maximum entropy inference and learning of graphical models to the quantum realm. The generalization, known as quantum iterative scaling (QIS), is straightforward, but the key challenge lies in the non-commutative nature of quantum problem instances. We explore quasi-Newton methods to enhance the performance of QIS and GD.
• Score: 4.9614587340495
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Maximum entropy inference and learning of graphical models are pivotal tasks in learning theory and optimization. This work extends algorithms for these problems, including generalized iterative scaling (GIS) and gradient descent (GD), to the quantum realm. While the generalization, known as quantum iterative scaling (QIS), is straightforward, the key challenge lies in the non-commutative nature of quantum problem instances, rendering the convergence rate analysis significantly more challenging than the classical case. Our principal technical contribution centers on a rigorous analysis of the convergence rates, involving the establishment of both lower and upper bounds on the spectral radius of the Jacobian matrix for each iteration of these algorithms. Furthermore, we explore quasi-Newton methods to enhance the performance of QIS and GD. Specifically, we propose using Anderson mixing and the L-BFGS method for QIS and GD, respectively. These quasi-Newton techniques exhibit remarkable efficiency gains, resulting in orders of magnitude improvements in performance. As an application, our algorithms provide a viable approach to designing Hamiltonian learning algorithms.

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