Tobias Bauer
CEO & Co-Founder
Built quantum frequency converters for neutral atoms, trapped ions, color centers and quantum dots, and co-authored the experiments behind all four platform demonstrations listed above.
LinkedIn →Bridging quantum hardware to telecom wavelengths
We build quantum frequency converters that bridge diverse quantum hardware to telecom C-band wavelengths, creating network-ready interfaces for long-distance quantum communication across any platform.
Wavelength mismatch
Most quantum memories emit photons at visible or near-infrared wavelengths, which makes them incompatible with telecom fiber infrastructure because of high transmission losses. Quantum frequency conversion converts those photons to telecom wavelengths while preserving the fragile quantum information they carry.
Key performance indicators
To distribute entanglement at usable fidelity, every conversion step has to be as efficient as possible without adding noise to the quantum signal.
Deployability
A converter that only works on an optical table is not infrastructure. Ours is built for standard 19-inch racks and does not require laboratory conditions.
Research
Built on experience
The team has personally worked with different major qubit platforms: peer-reviewed, not roadmap promises.
- Trapped neutral atoms
T. van Leent, M. Bock, F. Fertig, R. Garthoff, S. Eppelt, Y. Zhou, P. Malik, M. Seubert, T. Bauer, W. Rosenfeld, W. Zhang, C. Becher, H. Weinfurter, “Entangling single atoms over 33 km telecom fibre”, Nature 607, 69–73 (2022). Read the paper →
- Trapped ions
E. Arenskötter, T. Bauer, S. Kucera, M. Bock, J. Eschner, C. Becher, “Telecom quantum photonic interface for a ⁴⁰Ca⁺ single-ion quantum memory”, npj Quantum Information 9, 34 (2023). Read the paper →
- Color centers in diamond
M. Schäfer, B. Kambs, D. Herrmann, T. Bauer, C. Becher, “Two-stage, low-noise quantum frequency conversion of single photons from silicon-vacancy centers in diamond to the telecom C-band”, Advanced Quantum Technologies 2300228 (2023). Read the paper →
- Quantum dots
T. Strobel, M. Vyvlecka, I. Neureuther, T. Bauer, M. Schäfer, et al., “Telecom-wavelength quantum teleportation using frequency-converted photons from remote quantum dots”, Nature Communications 16, 10027 (2025). Read the paper →
Hardware
- Conversion wavelength
- Customer specific
- Emitter wavelength to any visible, NIR or telecom wavelength
- Coupling
- Fiber in, fiber out
- Single-mode, connectorized
- Form factor
- 19-inch rack unit
- Target production housing
- Qubit encoding
- Polarization or time-bin
- Depending on your setup
- Efficiency
- 30-60%
- Fiber-to-fiber; depending on wavelength
- Noise
- below 10 cts/s/GHz
- Depending on wavelength and filter bandwidth
Every system is tailored to a specific emitter, so exact efficiency and noise figures, integration notes and pricing are shared directly for your setup.
Team
The people behind the conversion
Marlon Schäfer
CSO & Co-Founder
Lead author of the two-stage, low-noise conversion of single photons from silicon-vacancy centers in diamond to the telecom C-band; focuses on conversion efficiency and noise performance.
LinkedIn →
David Lindler
CTO & Co-Founder
Turns lab-bench conversion setups into rack-mounted, temperature-stable hardware that runs outside laboratory conditions.
LinkedIn →Photos: Viktoriia Karakatsii
Advisor
Prof. Dr. Christoph Becher
Scientific Advisor
Professor of experimental physics at Universität des Saarlandes with more than 20 years of experience in quantum frequency conversion, single-photon sources and quantum repeater architectures.
Photo: © Beate Wehrle, UdS
Contact
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