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arXiv · 2603.17071

Scalable quantum resources with short-range interacting spin-$\frac12$ chains

Marcin Płodzień·Jan Chwedeńczuk
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Abstract

The dynamical generation of quantum resources, such as many-body entanglement, Bell correlations or spin squeezing, can be achieved via one-axis twisting (OAT) dynamics, which require all-to-all couplings. However, current digital and analog quantum simulation platforms natively provide short-range or power-law couplings that decay too quickly for this purpose. We demonstrate that two spin-$\tfrac12$ chain models -- a staggered nearest-neighbor XXX chain and a long-range XXZ chain -- develop an effective OAT nonlinearity when projected onto the symmetric sector. We show that these dynamics generate metrologically useful spin-squeezed states and Greenberger-Horne-Zeilinger coherences that ensure violation of many-body Bell inequalities. We confirm the accuracy of this mapping by comparing it to the exact dynamics and demonstrate that the generated correlations can be read out using a single probe qubit. The resulting dynamics can be simulated with analog and digital quantum simulators.

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Marcin Płodzień, Jan Chwedeńczuk. 2026-03-17. Scalable quantum resources with short-range interacting spin-$\frac12$ chains. https://arxiv.org/abs/2603.17071

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