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arXiv 2408.14970quant-ph
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一点自校正

A little bit of self-correction

Michael J. Kastoryano, Lasse B. Kristensen, Chi-Fang Chen, András Gilyén

AI总结:

本文研究有限自旋链低温热动力学中稳定子空间的出现,发现无退相干qudit子空间源于低激发态对称性,而非基态纠缠,并指出其对对称性破缺微扰敏感,为自校正研究开辟新方向。

摘要:

我们研究了有限自旋链低温量子热动力学中稳定子空间的出现。我们的分析揭示了有效无退相干qudit子空间的存在,这些子空间在指数于$\eta$的时间尺度上持续存在。令人惊讶的是,亚稳子空间的出现与基态(或多个基态)的纠缠结构并无直接关联。相反,它们源于低激发态中的对称关系。尽管这些子空间在“相”内具有稳定性,但实际实现稳定量子比特受到对对称性破缺微扰敏感性的阻碍。这项工作强调了非交换多体模型的热动力学中可能存在非平凡的量子行为,并为更广泛地研究此类系统中的自校正打开了大门。

英文摘要:

We investigate the emergence of stable subspaces in the low-temperature quantum thermal dynamics of finite spin chains. Our analysis reveals the existence of effective decoherence-free qudit subspaces, persisting for timescales exponential in $β$. Surprisingly, the appearance of metastable subspaces is not directly related to the entanglement structure of the ground state(s). Rather, they arise from symmetry relations in low-lying excited states. Despite their stability within a 'phase', practical realization of stable qubits is hindered by susceptibility to symmetry-breaking perturbations. This work highlights that there can be non-trivial quantum behavior in the thermal dynamics of noncommuting many body models, and opens the door to more extensive studies of self-correction in such systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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