A Lindblad-Pauli Framework for Coarse-Grained Chaotic Binary-State Dynamics

TL;DR

This paper introduces a novel two-state density-matrix framework using Lindblad dynamics to better understand and model coarse-grained chaotic binary-state systems like the Duffing oscillator, capturing complex stochastic behaviors.

Contribution

It develops a density-matrix approach with explicit solutions and diagnostics for modeling chaotic bistable systems, extending classical Markov models to include quantum-inspired formalisms.

Findings

Closed-form solutions and Kraus representations derived.

Framework effectively models inter-well switching dynamics.

Diagnostics for Markov assumption validity provided.

Abstract

Coarse-graining a chaotic bistable oscillator into a binary symbol sequence is a standard reduction, but it often obscures the geometry of the reduced state space and structural constraints of physically meaningful stochastic evolution. We develop a two-state framework that embeds coarse-grained left/right statistics of the driven Duffing oscillator into a $2\times2$ density-matrix representation and models inter-well switching by a two-rate Gorini--Kossakowski--Sudarshan--Lindblad (GKSL) generator. For diagonal states the GKSL dynamics reduces to the classical two-state master equation.The density-matrix language permits an operational ``Bloch half-disk'' embedding with overlap parameter $c(\varepsilon)$ quantifying partition fuzziness; the GKSL model is fitted to diagonal marginals treating $c(\varepsilon)$ as diagnostic. We derive closed-form solutions, an explicit Kraus representation (generalized amplitude damping with dephasing and rotation), and practical diagnostics for the time-homogeneous first-order Markov assumption (order tests, Chapman--Kolmogorov consistency, run-length statistics, stationarity checks). When higher-order memory appears, we extend the framework via augmented Markov models, constructing CPTP maps through discrete-time Kraus representations; continuous-time GKSL generators may not exist for all empirical transition matrices. We provide a numerical pipeline with templates for validating the framework on Duffing simulations. The density-matrix formalism is an organizational convenience rather than claiming quantum-classical equivalence.