Coherent control of spin tunneling in a spin-orbit coupled bosonic triple well

TL;DR

This paper analytically and numerically investigates the coherent control of spin tunneling in a driven spin-orbit coupled bosonic triple-well system, revealing pathways for spin-flipping and spin-conserving tunneling useful for quantum technologies.

Contribution

It provides an analytical framework for controlling spin tunneling in a driven spin-orbit coupled triple-well, including a quantum spin switch scheme, advancing quantum control methods.

Findings

Analytical quasienergy spectrum under high-frequency approximation

Controlled spin-flipping and spin-conserving tunneling pathways

Numerical confirmation of analytical results and proposed spin switch scheme

Abstract

We study the coherent control of spin tunneling for a spin-orbit (SO) coupled boson held in a driven triple well. Under high-frequency approximation, we analytically obtain the quasienergies of the SO-coupled bosonic triple-well system and fine energy band structure is displayed. By adjusting the driving parameters, we reveal that the directed selective spin-flipping or spin-conserving tunneling of a SO-coupled boson occurs along different pathways and in different directions. The analytical results are numerically confirmed and perfect agreements are found. Further, a scheme of quantum spin switch with or without spin-flipping is presented. These results may be useful for quantum information processing and the design of spintronic devices.