Reconfigurable bus-based quantum router for modular superconducting processors

Quantum Physics arXiv:2609.28881 (quant-ph) [Submitted on 24 Sep 2026] Title:Reconfigurable bus-based quantum router for modular superconducting processors Authors:Benzheng Yuan, chaojie Zhang, Yangyang Fei, Chuanbing Han, Haoran He, Huihui Sun, Bo Zhao, Fudong Liu, Weilong Wang, Zheng Shan View a PDF of the paper titled Reconfigurable bus-based quantum router for modular superconducting processors, by Benzheng Yuan and 9 other authors View PDF HTML (experimental) Abstract:Scaling superconducting quantum processors requires interconnects that provide both non-local connectivity and parallel entangling operations. Nearest-neighbour couplings require distant interactions to be routed through SWAP networks, increasing the native two-qubit-gate count and potentially extending the circuit critical path. Here we introduce a bus-based reconfigurable quantum router for modular superconducting processors. Flux-tunable SQUID couplers selectively connect interface qubits to two shared buses, allowing destructive interference to suppress idle interactions while supporting two disjoint controlled-$Z$ (CZ) gates in parallel. Full-system Hamiltonian simulations yield parallel-gate errors at the level of $10^{-3}$, and open-system analysis identifies the coherence requirements for high-fidelity operation. We further assess the circuit-level consequences using hardware-aware compilation and resource-constrained scheduling. For 36-qubit quantum Fourier transform (QFT), QAOA-MaxCut and random-pairing circuits, the router reduces the median SWAP count by up to $34\%$ and the native CZ count by up to $20\%$ relative to a matched two-dimensional grid. End-to-end depth reduction is circuit dependent, reaching $20\%$ for QAOA-MaxCut but remaining negligible for the QFT despite its lower gate count. These results show that enhanced connectivity and schedulable parallelism provide distinct benefits, establishing the router as a compiler-visible hardware resource for modular superconducting quantum processors. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2609.28881 [quant-ph] (or arXiv:2609.28881v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2609.28881 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Benzheng Yuan [view email] [v1] Thu, 24 Sep 2026 00:58:51 UTC (954 KB) Full-text links: Access Paper: View a PDF of the paper titled Reconfigurable bus-based quantum router for modular superconducting processors, by Benzheng Yuan and 9 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-09 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)