Quantum Algorithm for Smoothed Particle Hydrodynamics

TL;DR

This paper introduces a quantum computing algorithm for smoothed particle hydrodynamics (SPH), enabling efficient fluid simulations by encoding SPH operators in quantum registers and demonstrating exponential error convergence.

Contribution

The paper develops a novel quantum algorithm for SPH that encodes operators in quantum registers and extends to PDE solutions, advancing quantum fluid simulation methods.

Findings

Error convergence is exponentially fast with increasing qubits.

The method accurately computes kernel sums and derivatives in 1D.

Successfully extends to advection and diffusion PDEs.

Abstract

We present a quantum computing algorithm for the smoothed particle hydrodynamics (SPH) method. We use a normalization procedure to encode the SPH operators and domain discretization in a quantum register. We then perform the SPH summation via an inner product of quantum registers. Using a one-dimensional function, we test the approach in a classical sense for the kernel sum and first and second derivatives of a one-dimensional function, using both the Gaussian and Wendland kernel functions, and compare various register sizes against analytical results. Error convergence is exponentially fast in the number of qubits. We extend the method to solve the one-dimensional advection and diffusion partial differential equations, which are commonly encountered in fluids simulations. This work provides a foundation for a more general SPH algorithm, eventually leading to highly efficient simulations of complex engineering problems on gate-based quantum computers.