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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Communication, Networks, Repeaters, & QKD II

Q 60.5: Vortrag

Donnerstag, 5. März 2026, 15:45–16:00, P 10

Long-distance quantum communication sending single photons and keeping many — •Stefan Häussler and Peter van Loock — Institute of Physics, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany

We describe all-optical memory-based quantum repeaters for long-distance quantum communication, with memories realized in the form of fiber loops located in the repeater stations. The memories can be used to store components of logical Bell states encoded in quantum error correction codes and offer the possibility of performing teleportation-based error correction. By sending only single-photon states through the fibers connecting the stations, such repeaters can operate in the long-segment regime compatible with existing fiber-based communication infrastructure. We analyze the performance of our scheme for the Gottesman-Kitaev-Preskill code, including a concatenation with the Steane code, as well as the Quantum Parity Code, identifying operational regimes for total distances up to 10000km.

Keywords: Quantum repeater; Quantum error correction; GKP code; Quantum Parity code; Optical memories