Rotation Collision based Quantum Lattice Boltzmann Methods

• URL: http://arxiv.org/abs/2609.16721v1
• Date: Tue, 15 Sep 2026 06:46:45 GMT
• Title: Rotation Collision based Quantum Lattice Boltzmann Methods
• Abstract summary: We propose a novel quantum lattice Boltzmann method based on the rotation collision operator.<n>The non-unitary BGK relaxation is replaced by a unitary rotation in the amplitude space of the distribution function.<n>Some numerical experiments are performed to validate the developed QLBM.
• Score: 7.842086640057734
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In the existing quantum algorithms for the lattice Boltzmann method, resolving the unitarity problem of the BGK collision operator from first principles remains a fundamental challenge, and a systematically constructed unitary alternative that reproduces the BGK relaxation structure to leading order has not yet been established in the literature. In this work, we propose a novel quantum lattice Boltzmann method (QLBM) based on the rotation collision operator, in which the non-unitary BGK relaxation is replaced by a unitary rotation in the amplitude space of the distribution function, and the corresponding gate-level quantum circuits are also constructed. Specifically, the rotation collision operator is developed for both the D2Q5 model of the convection-diffusion equation and the D2Q9 model of the incompressible Navier--Stokes equations. It is worth noting that, for the D2Q5 model, the equilibrium-state preparation circuit can be precompiled and reused, and the resulting unitary blocks can be sequentially composed once the state-dependent collision parameters are specified. Finally, some numerical experiments are performed to validate the developed QLBM, demonstrating its accuracy and effectiveness.

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