Spin-selective electron transfer in quantum dot array

TL;DR

This paper presents a method for spin-selective, coherent electron transfer in silicon quantum dot arrays using magnetic fields and gate voltages, with protocols balancing speed and robustness, applicable to multi-electron systems.

Contribution

It introduces novel non-adiabatic, adiabatic, and shortcut-to-adiabaticity protocols for efficient spin-dependent electron transfer in quantum dot arrays.

Findings

Fast electron transfer achieved with non-adiabatic protocol.

Robustness against control pulse errors demonstrated.

Extension to multi-electron systems shown.

Abstract

We propose a spin-selective coherent electron transfer in a silicon-quantum-dot array. Oscillating magnetic fields and temporally controlled gate voltages are utilised to separate the electron wave function into different quantum dots depending on the spin state. We introduce non-adiabatic and adiabatic protocols which offer fast electron transfer and the robustness against the error in the control-field pulse area, respectively. We also study a shortcut-to-adiabaticity protocol which compromises these two protocols. We show that this scheme can be extended to multi-electron systems straightforwardly and used for non-local manipulations of the electrons.