Adiabatic Quantum Transport in a Spin Chain with a Moving Potential

TL;DR

This paper proposes a robust adiabatic quantum state transfer method in spin chains using a moving potential, enhancing quantum information transfer and electron tunneling control.

Contribution

It introduces a novel adiabatic transfer scheme employing a moving external potential, improving robustness against coupling fluctuations in spin chains.

Findings

The scheme is computationally shown to be robust against random fluctuations.

Application to quantum information transfer with dual spin chains is demonstrated.

Potential usefulness for electron tunneling control in quantum dot arrays.

Abstract

Many schemes to realize quantum state transfer in spin chains are not robust to random fluctuations in the spin-spin coupling strength. In efforts to achieve robust quantum state transfer, an adiabatic quantum population transfer scheme is proposed in this study. The proposed scheme makes use of a slowly moving external parabolic potential and is qualitatively explained in terms of the adiabatic following of a quantum state with a moving separatrix structure in the classical phase space of a pendulum analogy. Detailed aspects of our adiabatic population transfer scheme, including its robustness, is studied computationally. Applications of our adiabatic scheme in quantum information transfer are also discussed, with emphasis placed on the usage of a dual spin chain to encode quantum phases. The results should also be useful for the control of electron tunneling in an array of quantum dots.