Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 48: Poster – Quantum Optics, Technologies, and Optomechanics

Q 48.57: Poster

Wednesday, March 12, 2025, 17:00–19:00, Tent

Towards microwave-to-telecom transduction based on Erbium crystals — •Mayssane Selmani and Andreas Reiserer — Technical University of Munich, TUM School of Natural Sciences and Munich Center for Quantum Science and Technology (MCQST), 85748 Garching, Germany

Superconducting qubits are among the most developed platforms for quantum information processing; however, they cannot be connected over long distances using microwave photons. Thus, the development of a device capable of converting microwave to optical photons at telecommunication wavelengths with high efficiency and bandwidth would be a key enabler for the communication between remote quantum computers. To realize such a transducer, we explore two different systems:

First, we investigate erbium doped crystals which can have well-suited optical and microwave properties for efficient transduction depending on the host material. The Erbium is integrated into resonators with high quality factor for both transitions.

Second, on the other end of the concentration scale, we explore stoichiometric crystals, in which Erbium is integrated as part of the lattice and not as a dopant. This results in a high concentration of erbium spins without compromising the inhomogeneous broadening. At low temperatures, these crystals order antiferromagnetically and display magnon modes that can be used for transduction.

We will present first results of both approaches and discuss their prospects for high-efficiency transduction.

Keywords: Rare-earth ions; Erbium; Transduction; cQED