A perturbative approach to the solution of the Thirring quantum cellular automaton

TL;DR

This paper develops perturbative techniques for analyzing the Thirring Quantum Cellular Automaton, enabling the computation of transition matrices in multi-particle sectors and addressing combinatorial complexities in one-dimensional fermionic systems.

Contribution

It introduces a perturbative path-sum approach for the Thirring QCA, expanding interaction vertices and mass, and classifies paths for different particle regimes, advancing analysis of local fermionic automata.

Findings

Computed transition matrices in two- and three-particle sectors.

Classified paths for very light and very heavy particles.

Provided results applicable to many-particle sectors in one dimension.

Abstract

The Thirring Quantum Cellular Automaton (QCA) describes the discrete time dynamics of local fermionic modes that evolve according to one step of the Dirac cellular automaton followed by the most general on-site number-preserving interaction, and serves as the QCA counterpart of the Thirring model in quantum field theory. In this work, we develop perturbative techniques for the QCA path-sum approach, expanding both the number of interaction vertices and the mass parameter of the Thirring QCA. By classifying paths within the regimes of very light and very heavy particles, we computed the transition matrices in the two- and three-particle sectors to the first few orders. Our investigation into the properties of the Thirring QCA, addressing the combinatorial complexity of the problem, yielded some useful results applicable to the many-particle sector of any on-site number-preserving interactions in one spatial dimension.