Y-junction splitting spin states of moving quantum dot

TL;DR

This paper simulates electron spin state transfer through a Y-junction using surface acoustic waves, demonstrating differentiation of singlet and triplet states via electrostatic detuning, which could aid quantum information measurement.

Contribution

It introduces a simulation of SAW-driven electron transfer in a Y-junction, showing how spin states can be distinguished for quantum computing applications.

Findings

Singlet and triplet states can be differentiated in the Y-junction.

Electrostatic detuning enables measurement of two-spin qubits.

SAW can reliably transfer electrons for quantum information processing.

Abstract

The development of a working quantum computer utilizing electron spin states as qubits is a major goal for many theorists and experimentalists. The future applications of quantum information technology would also require a reliable method for the transportation of quantum information. A promising such method is the propagation of electrons by a surface acoustic wave (SAW). In this paper, we simulate the SAW transfer of two interacting electrons through a Y-shaped junction. Our results show that the singlet and triplet states can be differentiated in the Y-junction by an electrostatic detuning potential, an effect that could be used in for example measuring the state of a two-spin qubit.