Quasiparticle tunneling in a periodically driven bosonic Josephson junction

TL;DR

This paper predicts and analyzes quantum beating effects in a driven bosonic Josephson junction, revealing a method to probe highly entangled mesoscopic states through dynamical tunneling phenomena.

Contribution

It introduces the concept of quantum beating between Trojan states in a driven bosonic Josephson junction and links it to dynamical tunneling and entanglement detection.

Findings

Quantum beating occurs between symmetry-related Trojan states.

The beating timescales are long compared to the driving period.

The phenomenon offers a robust way to probe entangled mesoscopic states.

Abstract

A resonantly driven bosonic Josephson junction supports stable collective excitations, or quasiparticles, which constitute analogs of the Trojan wave packets previously explored with Rydberg atoms in strong microwave fields. We predict a quantum beating effect between such symmetryrelated many-body Trojan states taking place on time scales which are long in comparison with the driving period. Within a mean-field approximation, this quantum beating can be regarded as a manifestation of dynamical tunneling. On the full N-particle level, the beating phenomenon leads to an experimentally feasible, robust strategy for probing highly entangled mesoscopic states.