Strong spin-photon coupling in silicon

TL;DR

This paper demonstrates strong coupling between a single electron spin in silicon and a microwave photon in a superconducting resonator, advancing scalable quantum computing with spin qubits.

Contribution

It reports the first strong spin-photon coupling in silicon, enabling large quantum dot spin qubit networks for scalable quantum computing.

Findings

Achieved strong coupling between electron spin and microwave photon.

Utilized a silicon double quantum dot and high-impedance resonator.

Enabled potential for scalable quantum dot spin qubit networks.

Abstract

We report the strong coupling of a single electron spin and a single microwave photon. The electron spin is trapped in a silicon double quantum dot and the microwave photon is stored in an on-chip high-impedance superconducting resonator. The electric field component of the cavity photon couples directly to the charge dipole of the electron in the double dot, and indirectly to the electron spin, through a strong local magnetic field gradient from a nearby micromagnet. This result opens the way to the realization of large networks of quantum dot based spin qubit registers, removing a major roadblock to scalable quantum computing with spin qubits.