Strong coupling between a photon and a hole spin in silicon

TL;DR

This paper demonstrates strong coupling between a microwave photon and a hole spin in silicon quantum dots, enabling potential advances in quantum information processing with scalable, on-chip quantum networks.

Contribution

It reports the first strong spin-photon coupling in silicon quantum dots using intrinsic spin-orbit interaction, with a high coupling rate of 330 MHz.

Findings

Achieved a spin-photon coupling rate of 330 MHz.

Demonstrated strong coupling exceeding decoherence rates.

Utilized foundry-compatible silicon MOS fabrication process.

Abstract

Spins in semiconductor quantum dots constitute a promising platform for scalable quantum information processing. Coupling them strongly to the photonic modes of superconducting microwave resonators would enable fast non-demolition readout and long-range, on-chip connectivity, well beyond nearest-neighbor quantum interactions. Here we demonstrate strong coupling between a microwave photon in a superconducting resonator and a hole spin in a silicon-based double quantum dot issued from a foundry-compatible MOS fabrication process. By leveraging the strong spin-orbit interaction intrinsically present in the valence band of silicon, we achieve a spin-photon coupling rate as high as 330~MHz largely exceeding the combined spin-photon decoherence rate. This result, together with the recently demonstrated long coherence of hole spins in silicon, opens a new realistic pathway to the development of circuit quantum electrodynamics with spins in semiconductor quantum dots.