Date: WEDNESDAY, March 18th, 2026

Time: 11:40 am

Place: Theoretical Physics Seminar Room (Faculty of Science & Technology, Leioa, UPV/EHU)

Title: Towards on-chip microwave to telecom transduction using erbium doped silicon

Speaker: Daniele Lopriore (Technical University of Munich, TUM School of Natural, Sciences and Munich Center for Quantum Science and Technology, 85748 Garching)

Abstract:

The development of a device that converts microwave to optical photons at telecommunication wavelengths 

would be a key enabler for communication between remote quantum computers and would pave the way for the entanglement 

of distant superconducting qubits. We investigate ensembles of erbium dopants that exhibit coherent microwave [1] and optical 

transitions [2]. They can be used as a nonlinear medium mediating an efficient Raman conversion process [3]. High efficiencies 

require enhancing both the microwave and the telecom transitions with high quality factor resonators. I will present our progress 

towards low-loss manufacturing and measurements of the spin properties in erbium-doped silicon waveguides, and give an outlook

towards the transduction efficiencies achievable with our approach [4].

[1] A. Gritsch, et al. arXiv:2405.05351 (2024).
[2] A. Gritsch, et al. Phys.Rev.X 12, 041009 (2022).
[3] C. O’Brien, et al. Phys.Rev.Lett. 113, 063603 (2014).
[4] J. Früh, et al. 10.48550/arXiv.2601.13666 (2026).