Greenhorn Meeting 2026

Session

Quantumcommunication

8 Oct 2026, 11:45

Institute for Quantum Physics

12. Exploring Nickel Vacancies for Improved Quantum Repeaters

Florian Rickert (Universität Hamburg)

08/10/2026, 11:45

Talk

As quantum computers advance, the need for quantum networks becomes more apparent. In order to realize a quantum internet, we need to connect processors over long distances. With quantum cryptography, security levels in communication could then be raised to unprecedented levels.

Due to the exponential loss of photons in fibers over long distances, an optical quantum network relies on...

20. Telecom-to-Visible Fiber-Integrated Quantum Frequency Conversion

Felix Rohe (Universität des Saarlandes)

08/10/2026, 12:00

Talk

Telecom quantum light sources such as quantum dots, as well as weak coherent laser pulses have recently been gaining importance for quantum repeater applications, by entangling the photons with quantum memory nodes, possessing long spin coherence times [1]. However, since most of the quantum memories exhibit an optical interface in the visible or near-infrared, telecom-to-visible quantum...

24. Investigation of Tin-Vacancy Centers in Diamond for Quantum Repeater Applications

Linus Ehre (Saarland University)

08/10/2026, 12:15

Talk

Quantum networks play an important role in quantum information science as they promise secure communication as well as applications in distributed quantum computing and quantum metrology. To expand them over large distances, however, quantum repeaters based on entanglement distribution are required to minimize optical fiber losses. This increases the demand for efficient interfaces between...

30. Optical Memory in a Microfabricated Rubidium Vapor Cell

Joscha Locher (Universität Basel)

08/10/2026, 13:45

Talk

Large-scale quantum networks require a scalable, mass-producible memory platform. Ground-state atomic vapor memories are a promising candidate: room-temperature operation makes them experimentally simple, and they have been shown to perform well across a range of figures of merit. Their noise performance is compatible with preserving the non-classical photon-number statistics of retrieved...

31. Towards consumer-level quantum-secure cryptography using entanglement-based short-range quantum-key-distribution

Marco Arnds (Universität Hamburg)

08/10/2026, 14:00

Talk

Quantum key distribution (QKD), which generates a cryptographic
key via a quantum channel, has paved the way for physically secure
communication. Over the last decades, most efforts in developing QKD
focused on long-distance implementations, which are costly and challenging due to exponential losses of photons in quantum channels. An alternative approach is hybrid cryptography, where key...