Information Dynamics in Quantum Harmonic Systems: Insights from Toy Models

TL;DR

This paper explores quantum information dynamics in coupled harmonic oscillators, revealing how correlations and control protocols are affected by system parameters, with implications for optimizing quantum technology operations.

Contribution

It introduces a detailed analysis of quantum correlations and control strategies in harmonic systems using exact Gaussian methods, highlighting the effects of various parameters.

Findings

Mutual information and synchronization diverge in nonlinear regimes.

Smooth control sequences reduce excitations and operational errors.

Circuit complexity correlates with fidelity and dynamical regularity.

Abstract

This study investigates the dynamics of quantum information and computational resources using a tractable model of coupled harmonic oscillators. We precisely characterize the interplay between mutual information, synchronization, and circuit complexity, demonstrating that they serve as complementary yet distinct measures of quantum correlations. Our analysis reveals how coupling strength, detuning, and external magnetic fields modulate these quantities, with synchronization and mutual information exhibiting marked divergence in nonlinear regimes. By employing exact Gaussian methods, we compute the circuit depth required to prepare target states and connect increased fidelity to more regular dynamical behavior. Furthermore, we analyze single-ion transport in a harmonic trap, comparing sudden and adiabatic protocols. We introduce a nonadiabaticity metric to quantify the fidelity-complexity trade-off, showing that smooth control sequences significantly minimize operational errors by suppressing excitations. These results provide a refined understanding of quantum correlations and offer concrete principles for optimizing control strategies in quantum technologies.