Direct measurement of non-local interactions in the many-body localized phase
Abstract
The interplay of interactions and strong disorder can lead to an exotic quantum many-body localized (MBL) phase. Beyond the absence of transport, the MBL phase has distinctive signatures, such as slow dephasing and logarithmic entanglement growth; they commonly result in slow and subtle modification of the dynamics, making their measurement challenging. Here, we experimentally characterize these properties of the MBL phase in a system of coupled superconducting qubits. By implementing phase sensitive techniques, we map out the structure of local integrals of motion in the MBL phase. Tomographic reconstruction of single and two qubit density matrices allowed us to determine the spatial and temporal entanglement growth between the localized sites. In addition, we study the preservation of entanglement in the MBL phase. The interferometric protocols implemented here measure affirmative correlations and allow us to exclude artifacts due to the imperfect isolation of the system. By measuring elusive MBL quantities, our work highlights the advantages of phase sensitive measurements in studying novel phases of matter.
Keywords
Cite
@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}
}
Comments
5+28 pages, 5+22 figures, updated version