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Carmen Hoek

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Proceedings Article | 15 November 2024 Presentation + Paper

Quantum computing for partial differential equations in practice

Niels Neumann, Jasper Verbree, Carmen Hoek

Proceedings Volume 13202, 1320208 (2024) https://doi.org/10.1117/12.3033212

KEYWORDS: Quantum systems, Quantum states, Matrices, Partial differential equations, Quantum computing, Computing systems, Differential equations, Quantum circuit implementation, Finite element methods, Quantum numbers

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Quantum computers have the potential to solve some complex problems much faster than classical equivalents. Significant research efforts are aimed at determining which algorithms give which advantages for different use-cases. An application where quantum computers can possibly bring great advantages is solving (partial) differential equations, which has a broad set of applications, for instance in wave-propagation models. Few differential equations admit an analytical solution. For most heuristic methods are required to approximate a solution. Well-known heuristic techniques include the finite element and finite difference method, where the considered space is partitioned and systems of linear equations resulting from this partitioning need to be solved. Quantum computing puts forward new methods to solve these systems of linear equations and hence these differential equations. First, the HHL algorithm gives an efficient way to solve a linear system of equations. The HHL algorithm comes with drawbacks, but in this specific use-case some of these objections might be circumvented. Quantum computers furthermore offer the variational approach: an optimization-based path to solving differential equations. With this approach, the devices might even ‘learn’ the noise patterns emerging in present day quantum computers and compensate for it. In this work we revisit quantum methods for solving partial differential equations and consider how well they work in solving differential equations in practice. We also discuss possible caveats and bottlenecks of the approaches.

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