Spatial Magnetometry and Entanglement Transport in Neutral-Atom Arrays
Kent Ueno
Location: QNC 1201
Abstract
Spatial magnetic field sensing and Rydberg-mediated entanglement transport require different atomic states, control methods, and stability conditions, raising the question of whether both can be supported within a single fixed-geometry, site-resolved neutral-atom platform. This talk presents an experimental demonstration of phase-shear magnetometry and gradiometry in a two-dimensional optical tweezer array, together with a theoretical and numerical study of coherent entanglement transport through a static Rydberg chain. In the magnetometry protocol, a controlled magnetic field gradient imprints a position-dependent Ramsey phase that shifts the field signal to a finite spatial wavevector, allowing single-shot spin-resolved images to recover both the global field and its gradient even when global phase diffusion degrades conventional shot-averaged Ramsey measurements. The demonstrated differential-field and gradient sensitivities are 3.2 nT/√Hz and 7.2 pT/μm/√Hz, respectively, and the same global field estimator is used for feedback stabilization. For entanglement transport, engineered atom positions and local detunings map the driven Rydberg Hamiltonian onto an effective XX model that supports perfect state transfer and the distribution of distillable entanglement over tens of micrometres. The analysis evaluates the effects of perturbative corrections, long-range interactions, radiative decay, positional uncertainty, and spin-motion dephasing. Together, these results establish the physical compatibility of spatial magnetometry and modeled entanglement transport on the same neutral-atom architecture, while identifying the conditions and remaining steps required for their future experimental integration.
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