多体局域化相中非局域相互作用的直接测量
无序系统与神经网络
2020-07-09 v2 统计力学
强关联电子
量子物理
摘要
相互作用与强无序的相互作用可导致奇异的量子多体局域化（MBL）相。除无输运外，MBL 相具有独特特征，如缓慢退相与对数纠缠增长；它们通常导致动力学的缓慢且细微的修正，使其测量颇具挑战性。在此，我们在耦合超导量子比特系统中实验表征了 MBL 相的这些性质。通过实现相位敏感技术，我们描绘了 MBL 相中局域运动积分的结构。单量子比特与双量子比特密度矩阵层析重建使我们能够确定局域位点间的空间与时间纠缠增长。此外，我们研究了 MBL 相中纠缠的保持。此处实现的干涉协议测量了确证性关联，并使我们能够排除因系统隔离不完善导致的伪影。通过测量难以捕捉的 MBL 量，我们的工作凸显了相位敏感测量在研究物质新相中的优势。
引用
@article{arxiv.1910.06024,
title = {Direct measurement of non-local interactions in the many-body localized phase},
author = {B. Chiaro and C. Neill and A. Bohrdt and M. Filippone and F. Arute and K. Arya and R. Babbush and D. Bacon and J. Bardin and R. Barends and S. Boixo and D. Buell and B. Burkett and Y. Chen and Z. Chen and R. Collins and A. Dunsworth and E. Farhi and A. Fowler and B. Foxen and C. Gidney and M. Giustina and M. Harrigan and T. Huang and S. Isakov and E. Jeffrey and Z. Jiang and D. Kafri and K. Kechedzhi and J. Kelly and P. Klimov and A. Korotkov and F. Kostritsa and D. Landhuis and E. Lucero and J. McClean and X. Mi and A. Megrant and M. Mohseni and J. Mutus and M. McEwen and O. Naaman and M. Neeley and M. Niu and A. Petukhov and C. Quintana and N. Rubin and D. Sank and K. Satzinger and A. Vainsencher and T. White and Z. Yao and P. Yeh and A. Zalcman and V. Smelyanskiy and H. Neven and S. Gopalakrishnan and D. Abanin and M. Knap and J. Martinis and P. Roushan},
journal= {arXiv preprint arXiv:1910.06024},
year = {2020}
}
备注
5+28 pages, 5+22 figures, updated version