Probing dynamical phase transitions with a superconducting quantum simulator

103Citations
Citations of this article
68Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

Nonequilibrium quantum many-body systems, which are difficult to study via classical computation, have attracted wide interest. Quantum simulation can provide insights into these problems. Here, using a programmable quantum simulator with 16 all-to-all connected superconducting qubits, we investigate the dynamical phase transition in the Lipkin-Meshkov-Glick model with a quenched transverse field. Clear signatures of dynamical phase transitions, merging different concepts of dynamical criticality, are observed by measuring the nonequilibrium order parameter, nonlocal correlations, and the Loschmidt echo. Moreover, near the dynamical critical point, we obtain a spin squeezing of −7.0 ± 0.8 dB, showing multipartite entanglement, useful for measurements with precision fivefold beyond the standard quantum limit. On the basis of the capability of entangling qubits simultaneously and the accurate single-shot readout of multiqubit states, this superconducting quantum simulator can be used to study other problems in nonequilibrium quantum many-body systems, such as thermalization, many-body localization, and emergent phenomena in periodically driven systems.

Cite

CITATION STYLE

APA

Xu, K., Sun, Z. H., Liu, W., Zhang, Y. R., Li, H., Dong, H., … Wang, H. (2020). Probing dynamical phase transitions with a superconducting quantum simulator. Science Advances, 6(25). https://doi.org/10.1126/sciadv.aba4935

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free