Rare earth spin ensemble magnetically coupled to a superconducting resonator

TL;DR

This paper demonstrates the magnetic coupling of Er$^{3+}$ spin ensembles in Y$_{2}$SiO$_{5}$ to a superconducting resonator, advancing the integration of microwave and optical quantum systems.

Contribution

It presents the first experimental realization of magnetic coupling between rare earth ion spins and a superconducting resonator.

Findings

Successful magnetic coupling of Er$^{3+}$ spins to a superconducting resonator.

Potential for bridging microwave and optical quantum systems.

Advancement towards integrated quantum information processing.

Abstract

Interfacing superconducting quantum processors, working in the GHz frequency range, with optical quantum networks and atomic qubits is a challenging task for the implementation of distributed quantum information processing as well as for quantum communication. Using spin ensembles of rare earth ions provide an excellent opportunity to bridge microwave and optical domains at the quantum level. In this letter, we demonstrate magnetic coupling of Er$^{3+}$ spins doped in Y$_{2}$SiO$_{5}$ crystal to a high-Q coplanar superconducting resonator.