Disorder-tunable entanglement at infinite temperature

• URL: http://arxiv.org/abs/2312.10216v2
• Date: Tue, 3 Sep 2024 18:02:35 GMT
• Title: Disorder-tunable entanglement at infinite temperature
• Authors: Hang Dong, Jean-Yves Desaules, Yu Gao, Ning Wang, Zexian Guo, Jiachen Chen, Yiren Zou, Feitong Jin, Xuhao Zhu, Pengfei Zhang, Hekang Li, Zhen Wang, Qiujiang Guo, Junxiang Zhang, Lei Ying, Zlatko Papić,
• Abstract summary: We build a custom-built superconducting qubit ladder to realize non-thermalizing states with rich entanglement structures. Despite effectively forming an "infinite" temperature ensemble, these states robustly encode quantum information far from equilibrium.
• Score: 18.552959588855124
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Emerging quantum technologies hold the promise of unraveling difficult problems ranging from condensed matter to high energy physics, while at the same time motivating the search for unprecedented phenomena in their setting. Here we utilize a custom-built superconducting qubit ladder to realize non-thermalizing states with rich entanglement structures in the middle of the energy spectrum. Despite effectively forming an "infinite" temperature ensemble, these states robustly encode quantum information far from equilibrium, as we demonstrate by measuring the fidelity and entanglement entropy in the quench dynamics of the ladder. Our approach harnesses the recently proposed type of non-ergodic behavior known as "rainbow scar", which allows us to obtain analytically exact eigenfunctions whose ergodicity-breaking properties can be conveniently controlled by randomizing the couplings of the model, without affecting their energy. The on-demand tunability of quantum correlations via disorder allows for in situ control over ergodicity breaking and it provides a knob for designing exotic many-body states that defy thermalization.

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