An Atomtronic Flux Qubit: A ring lattice of Bose-Einstein condensates interrupted by three weak links

TL;DR

This paper investigates a Bose-Einstein condensate in a ring lattice with three weak links under an effective flux, revealing a two-level quantum system suitable for atomtronic qubits through path integral and exact diagonalization methods.

Contribution

It introduces a novel atomtronic flux qubit design using a ring lattice with weak links and demonstrates its quantum two-level system behavior.

Findings

Emergence of a two-level system at flux degeneracy

Quantum fluctuations influence the system's spectrum

Experimental realization via spatial light modulator

Abstract

We study a physical system consisting of a Bose-Einstein condensate confined to a ring shaped lattice potential interrupted by three weak links. The system is assumed to be driven by an effective flux piercing the ring lattice. By employing path integral techniques, we explore the effective quantum dynamics of the system in a pure quantum phase dynamics regime. Moreover, the effects of the density's quantum fluctuations are studied through exact diagonalization analysis of the spectroscopy of the Bose-Hubbard model. We demonstrate that a clear two-level system emerges by tuning the magnetic flux at degeneracy. The lattice confinement, platform for the condensate, is realized experimentally employing a spatial light modulator.