Time Reversibility of Quantum Diffusion in Small-world Networks

TL;DR

This study investigates how quantum diffusion in small-world networks exhibits time irreversibility, showing that perturbations during time reversal increase irreversibility, which is more pronounced in Watts-Strogatz networks than in regular lattices.

Contribution

It demonstrates the linear relationship between perturbation strength and irreversibility in quantum diffusion on small-world networks, highlighting the impact of network topology.

Findings

Irreversibility increases linearly with perturbation strength.

Reversibility is perfect without perturbation (η=0).

Irreversibility is stronger in Watts-Strogatz networks than in regular networks.

Abstract

We study the time-reversal dynamics of a tight-binding electron in the Watts-Strogatz (WS) small-world networks. The localized initial wave packet at time $t=0$ diffuses as time proceeds until the time-reversal operation, together with the momentum perturbation of the strength $\eta$, is made at the reversal time $T$. The time irreversibility is measured by $I \equiv |\Pi(t = 2T) - \Pi(t = 0)|$, where $\Pi$ is the participation ratio gauging the extendedness of the wavefunction and for convenience, $t$ is measured forward even after the time reversal . When $\eta = 0$, the time evolution after $T$ makes the wavefunction at $t=2T$ identical to the one at $t=0$, and we find I=0, implying a null irreversibility or a complete reversibility. On the other hand, as $\eta$ is increased from zero, the reversibility becomes weaker, and we observe enhancement of the irreversibility. We find that $I$ linearly increases with increasing $\eta$ in the weakly-perturbed region, and that the irreversibility is much stronger in the WS network than in the local regular network.