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arXiv · 2507.17488

Fragmented quantum phases in anti-blockade regime of Rydberg atom array

Han-Chao Chen·Zheng-Yuan Zhang·Meng Zhou·Xin Liu·Li-Hua Zhang·Bang Liu·Lu-Xia Wang·Dong-Sheng Ding·Bao-Sen Shi
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Abstract

In this Letter, we report a parameter-dependent Hilbert space fragmentation in a one-dimensional Rydberg atom array under anti-blockade conditions. We identify distinct non-equilibrium dynamical phases and show that their quasi-periodic behavior arises from the interplay of multi-path interference and multi-photon cascaded excitations, reflecting fundamental differences in state connectivity and effective dimensionality. By constructing a complete phase diagram, we reveal the transition from thermalization to fragmentation, and further demonstrate a secondary fragmentation process enabled by local constraints. Our results highlight the potential of anti-blockade mechanisms for programmable non-thermal dynamics in many-body systems.

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Han-Chao Chen, Zheng-Yuan Zhang, Meng Zhou, Xin Liu, Li-Hua Zhang, Bang Liu, Lu-Xia Wang, Dong-Sheng Ding, Bao-Sen Shi. 2025-07-23. Fragmented quantum phases in anti-blockade regime of Rydberg atom array. https://arxiv.org/abs/2507.17488

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