Dr. Lukasz Dusanowski, Associate Research Scholar at the Department of Electrical and Computer Engineering at Princeton University, will be delivering a QRI seminar titled "Single Erbium Ions as Telecom Quantum Spin-Photon Interfaces" on March 11th, from 2:00 pm - 3:00 pm in West Hall, Room 340 (3rd floor). A Zoom option is also provided.


Seminar Description:


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. Using silicon photonic crystal cavities, we can isolate single erbium ions and investigate their optical and spin properties using resonance fluorescence and optically detected magnetic resonance. In this talk, I will show our recent work on erbium ions implanted into CaWO4, which enabled the observation of the high indistinguishability of subsequently emitted photons in the Hong-Ou-Mandel experiment [1]. This represents a notable step towards the construction of telecom band quantum repeater networks with single erbium ions. I will also discuss our recent progress on generating spin-photon and spin-spin entanglement.

[1] S. Ourari, Ł. Dusanowski, S.P. Horvath, M.T. Uysal, C.M. Phenicie, P. Stevenson, M. Raha, S. Chen, R.J. Cava, N.P. de Leon, and J.D. Thompson, Indistinguishable telecom band photons from a single Er ion in the solid state, Nature 620, 977 (2023).