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arXiv · 2512.14155

Fisher Information Measures under Lattice Combined Paul Trap

Precious Ogbonda Amadi·Paphon Pewkhom·Pruet Kalasuwan·Norshamsuri Ali·Syed Alwee Aljunid·Rosdisham Endut
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Abstract

We examine how the informational properties of a confined single ion response in a Paul trap modified by optical-lattice. We focus on the ground and first excited motional states and show that Fisher information, Shannon entropy, and Fisher-Shannon complexity track the effective frequency $\omega_{\mathrm{eff}}=\omega\sqrt{1-\kappa}$ of the potential. We show that the Fisher information and Shannon entropy reflect an effective frequency-driven redistribution of information between conjugate spaces. Our results show that the Fisher-Shannon complexity measure remains invariant under effective frequency control. The invariance demonstrates that optical modulation of $\kappa$ rescales localization, without altering the harmonic structure of the motional states. These results establish a controlled information-theoretic baseline for lattice-assisted Paul traps. Beyond the harmonic limit, retaining the quartic lattice correction introduces non-Gaussian wavefunction features through state-dependent mixing of higher eigenstates, which breaks the mutual compensation between Fisher information and Shannon entropy that sustains the invariant. The departure of $P'$ from its harmonic reference value intensifies with $\kappa$ and is stronger for the excited state, which confirms that the Fisher-Shannon complexity invariance is a distinctive property of the small-oscillation harmonic regime.

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Precious Ogbonda Amadi, Paphon Pewkhom, Pruet Kalasuwan, Norshamsuri Ali, Syed Alwee Aljunid, Rosdisham Endut. 2025-12-16. Fisher Information Measures under Lattice Combined Paul Trap. https://doi.org/10.1038/s41598-026-54236-2

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