Single Erbium Ions as Telecom Quantum Spin-Photon Interfaces

Single erbium ions in crystalline hosts are attractive candidates for solid-state spin-photon interfaces thanks to long-lived spin states and optical transitions in the telecom band, promising a clear advantage for long-distance quantum network applications. These ions can be incorporated into a wide range of host materials, which influence their spin and optical coherence properties through the concentration of other magnetic spins and the erbium site symmetry. In this work, we present a study of the spin and optical coherence properties of erbium ions implanted into CaWO4. Using silicon photonic crystal cavities, we isolate single erbium ions and investigate their optical and spin properties using resonance fluorescence and optically detected magnetic resonance. We investigate the effects of correlated environment noise by means of dynamical decoupling and photon correlation spectroscopy. In particular, we show the high indistinguishability of subsequently emitted photons in the Hong-Ou-Mandel experiment. We also discuss prospects for generating spin-photon and spin-spin entanglement with the current device architecture.

Bio:

Lukasz Dusanowski is an Associate Research Scholar working in the group of Jeff Thompson at Princeton University. His research focuses on investigating single rare earth ion dopants in solids as potential spin-photon interfaces for quantum network applications. Prior to joining Princeton, Lukasz worked as a postdoctoral fellow in the group of Sven Hoefling at the University of Wurzburg. There, he focused on developing various single-photon quantum emitter platforms and their integration with on-chip photonic circuits.