A superconducting cavity bus for single Nitrogen Vacancy defect centres in diamond

TL;DR

This paper proposes a superconducting cavity bus that enables strong magnetic coupling between microwave photons and Nitrogen Vacancy centers in diamond, facilitating quantum information transfer and control of electronic and nuclear spins over long distances.

Contribution

It introduces a novel interconnect design that links superconducting resonators to individual NV centers, enabling optical readout and long-distance nuclear spin coupling.

Findings

Design of a magnetic interconnect for NV centers

Potential for long-distance nuclear spin entanglement

Integration of optical and microwave control methods

Abstract

Circuit-QED has demonstrated very strong coupling between individual microwave photons trapped in a superconducting coplanar resonator and nearby superconducting qubits. In this work we show how, by designing a novel interconnect, one can strongly connect the superconducting resonator, via a magnetic interaction, to a small number (perhaps single), of electronic spins. By choosing the electronic spin to be within a Nitrogen Vacancy centre in diamond one can perform optical readout, polarization and control of this electron spin using microwave and radio frequency irradiation. More importantly, by utilising Nitrogen Vacancy centres with nearby 13C nuclei, using this interconnect, one has the potential build a quantum device where the nuclear spin qubits are connected over centimeter distances via the Nitrogen Vacancy electronic spins interacting through the superconducting bus.