Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 17: Quantum Communication and Networks: Theory

MON 17.6: Talk

Monday, September 8, 2025, 17:45–18:00, ZHG006

Merging-based Quantum Repeater — Maria Flors Mor-Ruiz¹, Jorge Miguel-Ramiro¹, •Julius Wallnöfer¹, Tim Coopmans^2,3, and Wolfgang Dür¹ — ¹Institute for Theoretical Physics, University of Innsbruck, Austria — ²QuTech, Delft University of Technology, The Netherlands — ³EEMCS, Delft University of Technology, The Netherlands

We introduce an alternative approach for the design of quantum repeaters based on generating entangled states of growing size. The scheme utilizes quantum merging operations, also known as fusion type-I operations, that allow the reintegration and reuse of entanglement. Unlike conventional swapping-based protocols, our method preserves entanglement after failed operations, thereby reducing waiting times, enabling higher rates, and introducing enhanced flexibility in the communication requests. Through proof-of-principle analysis, we demonstrate the advantages of this approach over standard repeater protocols, highlighting its potential for practical quantum communication scenarios.

Keywords: Quantum Communication; Quantum Repeater; Multi-partite Entanglement