EHU Quantum Center Seminar (Daniele Lopriore)

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

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