arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2208.03060quant-ph
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用量子Kibble-Zurek机制研究长程横场伊辛模型的临界行为

Probing critical behavior of long-range transverse-field Ising model through quantum Kibble-Zurek mechanism

B. -W. Li, Y. -K. Wu, Q. -X. Mei, R. Yao, W. -Q. Lian, M. -L. Cai, Y. Wang, B. -X. Qi, L. Yao, L. He, Z. -C. Zhou, L. -M. Duan

摘要:

捕获离子量子模拟器已经证明了高达数十个离子的不同物理模型的定性性质。特别是,在激光驱动下,线性离子链自然地具有长程伊辛相互作用,这已被用于各种现象,如量子相变、局域化、热化和信息传播。对于近期的实际应用,一个中心任务是找到更多的定量应用的噪声量子模拟器,是强大的参数中的小误差。在这里,我们报告的远程横向场伊辛模型使用多达61个离子的量子模拟和探测其量子相变通过Kibble-Zurek机制的临界行为。通过对耦合系数的标定和验证,我们实现了相同的模型,增加离子数,从而提取一个临界指数的有限尺寸效应。对于铁磁相互作用,我们的实验结果与以前的数值预测吻合得很好。对于反铁磁情况,由于相互作用中的挫折,信号太弱而不能拟合临界指数,但仍然与理论一致。

英文摘要:

The trapped ion quantum simulator has demonstrated qualitative properties of different physical models for up to tens of ions. In particular, a linear ion chain naturally hosts long-range Ising interactions under the laser driving, which has been used for various phenomena such as quantum phase transition, localization, thermalization and information propagation. For near-term practical usage, a central task is to find more quantitative applications of the noisy quantum simulators that are robust to small errors in the parameters. Here we report the quantum simulation of a long-range transverse-field Ising model using up to 61 ions and probe the critical behavior of its quantum phase transition through the Kibble-Zurek mechanism. By calibrating and verifying the coupling coefficients, we realize the same model for increasing ion numbers, so as to extract a critical exponent free of the finite size effect. For ferromagnetic interaction, our experimental result agrees well with the previous numerical predictions. As for the anti-ferromagnetic case, signals are too weak to fit a critical exponent due to the frustration in the interaction, but still consistent with the theory.

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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