Jul 2026· Anais do I Simpósio Brasileiro de Computação e Comunicação Quânticas (SBCCQ 2026)· pp. 25-36· 0 citations· 7 references
TL;DR
This paper proposes a virtual-link purification strategy in which multiple EPR pairs are used at each stage to create virtual links between non-adjacent nodes and then purified in cascade using symmetric purification.
Abstract
End-to-end entanglement distribution in multi-hop quantum networks experiences fidelity degradation as entanglement swapping progresses over noisy and heterogeneous channels. In this paper, we propose a virtual-link purification strategy in which multiple EPR pairs are used at each stage to create virtual links between non-adjacent nodes and then purified in cascade using symmetric purification. The approach allows parameterizing the number of links per stage and follows a hierarchical design, with a more complete first stage and simplified purification in subsequent stages. We implement a time-slot-based orchestrator and compare the proposal against conventional swapping under Werner and bit-flip noise models. The results indicate higher end-to-end fidelity with virtual-link purification.
A closed-form end-to-end fidelity recursion is derived that embeds single-segment DAEPP into the BDCZ scheme and gives a strict resource lower bound for any BDCZ baseline utilising BBPSSW purification to match DAHR's per-segment effective fidelity.
Vinay Kumar, Krishan Joshi, C. Cicconetti· 0 citations
We introduce a merging-based quantum repeater that departs from the conventional swapping paradigm by progressively growing multipartite entanglement. In contrast to swapping-based schemes, where a single failed operation often forces the entire protocol to restart, our approach reuses previously established entangle...
Maria Flors Mor-Ruiz, Jorge Miguel-Ramiro, Julius Wallnöfer et al.· npj Quantum Information· 0 citations
This work evaluates how degraded entanglement and communication latency affect teleportation-based distributed multipartite-entanglement-state construction and model imperfect Bell-pair sources using depolarizing noise channels and classical communication delays using thermal relaxation.
Ashley N. Tittelbaugh, Jerry Horgan, Rohan Bali et al.· arXiv.org· 0 citations
It is proved that accumulating and shuffling improves the expected success probability and the success-weighted output Bell fidelity over the baseline without accumulating and shuffling, for every finite number of accumulation rounds and in the asymptotic limit.
Allen Zang, Bi-Kun Li, Xi-Nan Chen et al.· 1 citation
In this study, for the first time, a novel routing and purification approach for quantum networks is presented, using the end-to-end (E2E) relative entropy of coherence (REC) together with E2E fidelity to determine the purification level and the feasibility of candidate paths.
Hilal Sultan Duranoglu Tunc, Joy Halder, Azita Hajizade et al.· Scientific Reports· 0 citations
A metropolitan-scale entanglement-based quantum communication network enabled by a quantum reconfigurable optical add-drop multiplexer (q-ROADM), which dynamically distributes polarisation-entangled photon pairs from a broadband source to six users over deployed campus and metropolitan fibre, is demonstrated.
Rui Wang, Marcus J. Clark, O. Alia et al.· 1 citation
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