Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 67: Poster – Quantum Information

Q 67.17: Poster

Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG

Quantum Routing in Quantum Networks — •Johanna Seitz, Lukas Pausch, and Matthias Zimmermann — Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institute of Quantum Technologies, Ulm, Germany

In the development of future quantum networks [1], investigating possible quantum-network applications beyond quantum key distribution protocols becomes more and more relevant, promising higher security over classical networks by communicating quantum information. Due to the no-cloning theorem, there is no direct quantum analogue to the classical network protocol of sending identical, unknown information to two receiving parties by creating copies before distribution. To overcome this, we develop a quantum routing scheme that takes an input state and sends partial information via superposition to two receiving parties (compare to: [2]). In this protocol, the amount of information distributed to each party is defined via an additional control qubit that is processed together with the input state. Furthermore, we analyze the reverse operation of quantum decoupling to recover the initial quantum state, which can be realized by non-deterministic operations. Research on quantum routing protocols like this could open up new applications for communication with quantum networks, going beyond the capabilities of current classical communication networks.

[1] S. Wehner, D. Elkouss, R. Hanson, Science 362, eaam9288 (2018).

[2] B.K. Behera, T. Reza, A. Gupta et al., Quantum Inf. Process. 18, 328 (2019).

Keywords: quantum networks; quantum communication; quantum routing