Entanglement resonances of driven multi-partite quantum systems

TL;DR

This paper demonstrates how to generate maximally entangled states in driven multi-partite quantum systems using Floquet theory, revealing universal entanglement resonances linked to spectral avoided crossings, applicable across various interactions.

Contribution

It introduces a universal mechanism for creating entanglement resonances in weakly interacting, periodically driven multi-partite systems, independent of specific interaction details.

Findings

Entanglement resonances correspond to avoided crossings in quasi-energy spectra.

The phenomenon is universal across different interaction mechanisms.

Results are relevant for experimental systems with unknown microscopic couplings.

Abstract

We show how to create maximally entangled dressed states of a weakly interacting multi-partite quantum system by suitably tuning an external, periodic driving field. Floquet theory allows us to relate, in a transparent manner, the occurrence of entanglement resonances to avoided crossings in the spectrum of quasi-energies, tantamount of well-defined conditions for the controlled, resonant interaction of particles. We demonstrate the universality of the phenomenon for periodically driven, weakly interacting two-level systems, by considering different interaction mechanisms and driving profiles. In particular, we show that entanglement resonances are a generic feature of driven, multi-partite systems, widely independent of the details of the interaction mechanism. Our results are therefore particularly relevant for experiments on interacting two-level systems, in which the microscopic realization of the inter-particle coupling is unknown.