A spin quantum bit with ferromagnetic contacts for circuit QED

TL;DR

This paper proposes a theoretical scheme for a spin qubit using double quantum dots with ferromagnetic contacts, enabling electric control and strong coupling to a superconducting cavity for on-chip quantum information processing.

Contribution

It introduces a novel all-electric spin qubit design with switchable coupling to cavity QED, applicable to various nanoconductors without specific band structure requirements.

Findings

Enables electric manipulation of spin states.

Achieves switchable strong coupling to a superconducting cavity.

Applicable to diverse nanoconductor systems.

Abstract

We theoretically propose a scheme for a spin quantum bit based on a double quantum dot contacted to ferromagnetic elements. Interface exchange effects enable an all electric manipulation of the spin and a switchable strong coupling to a superconducting coplanar waveguide cavity. Our setup does not rely on any specific band structure and can in principle be realized with many different types of nanoconductors. This allows to envision on-chip single spin manipulation and read-out using cavity QED techniques.