Coherent coupling of a single spin to microwave cavity photons

TL;DR

This paper demonstrates the coherent coupling of a single electron spin to microwave photons in a superconducting resonator, enabling potential quantum information processing applications.

Contribution

It introduces a nanoscale spin-valve circuit that hybridizes spin and charge states, achieving MHz-range spin-photon coupling while maintaining spin coherence.

Findings

Achieved spin-photon coupling up to the MHz range

Cooperativity reached 2.3

Spin coherence time about 60 ns

Abstract

Electron spins and photons are complementary quantum-mechanical objects that can be used to carry, manipulate and transform quantum information. To combine these resources, it is desirable to achieve the coherent coupling of a single spin to photons stored in a superconducting resonator. Using a circuit design based on a nanoscale spin-valve, we coherently hybridize the individual spin and charge states of a double quantum dot while preserving spin coherence. This scheme allows us to achieve spin-photon coupling up to the MHz range at the single spin level. The cooperativity is found to reach 2.3, and the spin coherence time is about 60ns. We thereby demonstrate a mesoscopic device suitable for non-destructive spin read-out and distant spin coupling.