Coherently manipulating flying qubits in a quantum wire with a magnetic impurity

TL;DR

This paper investigates how a magnetic impurity affects the behavior of flying qubits in a quantum wire, revealing that the impurity's spin can act as a filter for the qubit's spin state, with implications for quantum control.

Contribution

It introduces a one-dimensional tight-binding model to analyze spin-dependent scattering of flying qubits by a magnetic impurity, demonstrating spin filtering effects.

Findings

Impurity spin influences qubit transmission spectra

Spin-dependent scattering channels are split by the impurity

Impurity acts as a spin state filter for flying qubits

Abstract

e study the effect of a magnetic impurity with spin-half on a single propagating electron in a one-dimensional model system via the tight-binding approach. Due to the spin-dependent interaction, the scattering channel for the flying qubit is split, and its transmission spectrum is obtained. It is found that, the spin orientation of the impurity plays the role as a spin state filter for a flying qubit.