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QI: Fachverband Quanteninformation
QI 8: Implementations III
QI 8.1: Vortrag
Dienstag, 10. März 2026, 14:00–14:15, BEY/0137
Proposal of multi-mode couplers for all-to-all connectivity and long distance couplings for superconducting qubits — •Zhongyi Jiang1,2, Mira Sharma2, Simon Geisert3, Sören Ihssen3, Ioan Pop3,4,5, and Mohammad Ansari1 — 1Peter Grünberg Institute PGI-12, Forschungszentrum Jülich, Jülich 52425, Germany — 2Institute for Quantum Information, RWTH Aachen University, D-52056 Aachen, Germany — 3IQMT, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 4PHI, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 5Physics Institute 1, Stuttgart University, 70569 Stuttgart, Germany
The low connectivity in superconducting systems has become a crucial bottleneck for scaling up superconducting QPU and implementing error correction. Building on our previous theory of multi-mode couplers, we propose a coupler and QPU design with superconducting qubits that support native all-to-all connectivity and long distance couplings. In our design, each module consists of a central multi-mode coupler with qubits around it. The central coupler provides all-to-all coupling within the module. Between the modules, central couplers are coupled via a bus coupler. The central couplers and the bus coupler together provide long-distance coupling among qubits in different modules. We give theory analysis and numerical simulations for such a QPU design. We believe this gives a feasible path for scaling up superconducting qubits.
Keywords: coupler design; multi-mode couplers; all-to-all connectivity; modular architecture