Coherent tunneling via adiabatic passage in a three-well Bose-Hubbard system

TL;DR

This paper demonstrates that coherent tunneling via adiabatic passage (CTAP) can be achieved in a three-well Bose-Hubbard system, analyzing effects of interactions and detuning, and comparing quantum and mean-field models.

Contribution

It provides an analytical demonstration of CTAP in a three-well Bose-Hubbard system, including criteria for adiabaticity and an efficient basis reduction method.

Findings

CTAP is achievable in a three-well Bose-Hubbard system.

Detuning the middle well can restore CTAP disrupted by interactions.

Quantum and mean-field models show consistent results within the adiabatic regime.

Abstract

We apply the Bose-Hubbard Hamiltonian to a three-well system and show analytically that coherent transport via adiabatic passage (CTAP) of $N$ non-interacting particles across the chain is possible. We investigate the effect of detuning the middle well to recover CTAP when on-site interparticle interactions would otherwise disrupt the transport. The case of small interactions is restated using first-order perturbation theory to develop criteria for adibaticity that define the regime where CTAP is possible. Within this regime we investigate restricting the Hilbert space to the minimum necessary basis needed to demonstrate CTAP, which dramatically increases the number of particles that can be efficiently considered. Finally, we compare the results of the Bose-Hubbard model to a mean-field three-mode Gross-Pitaevskii analysis for the equivalent system.