Andreev spin qubits based on the helical edge states of magnetically doped two-dimensional topological insulators

TL;DR

This paper proposes a method to realize and manipulate Andreev spin qubits in topological insulator edge states using magnetic doping and microwave pulses, enabling quantum gate operations.

Contribution

It introduces a novel approach to create and control Andreev spin qubits in topological insulators with magnetic doping, including simulation of quantum gates.

Findings

Electrical dipole transitions enable optical control of the qubits.

Simulation of quantum gates demonstrates feasibility.

Potential for implementation in realistic devices.

Abstract

We show that Andreev spin qubits can be realized in a Josephson junction based on the helical edge states of a two-dimensional topological insulator (quantum spin Hall system) proximized by superconducting films, in the presence of magnetic doping. We demonstrate that the electrical dipole transitions between the Andreev spin states induced by the magnetic doping can be harnessed to optically manipulate the Andreev spin qubit by microwave radiation pulses. We numerically simulate the realization of NOT and Hadamard quantum logic gates, and discuss implementations in realistic setups.