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Superconducting qubit-resonator quantum processor with effective all-to-all connectivity

Michael Renger1,*,†, Jeroen Verjauw1,*,‡, Nicola Wurz1,*,§, Amin Hosseinkhani1, Caspar Ockeloen-Korppi2, Wei Liu2, Aniket Rath1, Manish J. Thapa1, Florian Vigneau1 et al.

Elisabeth Wybo1, Ville Bergholm2, Chun Fai Chan2, Bálint Csatári2, Saga Dahl2, Rakhim Davletkaliyev2, Rakshyakar Giri1, Daria Gusenkova1, Hermanni Heimonen2, Tuukka Hiltunen2, Hao Hsu1, Eric Hyyppä2, Joni Ikonen2, Tyler Jones1, Shabeeb Khalid2, Seung-Goo Kim2, Miikka Koistinen2, Anton Komlev2, Janne Kotilahti2, Vladimir Kukushkin2, Julia Lamprich1, Alessandro Landra2, Lan-Hsuan Lee2, Tianyi Li2, Per Liebermann2, Sourav Majumder1, Janne Mäntylä2, Fabian Marxer2, Arianne Meijer - van de Griend2, Vladimir Milchakov2, Jakub Mrożek2, Jayshankar Nath1, Tuure Orell2, Miha Papič1,3, Matti Partanen2, Alexander Plyushch2, Stefan Pogorzalek1, Jussi Ritvas2, Pedro Figueroa Romero1, Ville Sampo2, Marko Seppälä2, Ville Selinmaa2, Linus Sundström2, Ivan Takmakov2, Brian Tarasinski2, Jani Tuorila2, Olli Tyrkkö2, Alpo Välimaa2, Jaap Wesdorp2, Ping Yang1, Liuqi Yu2, Johannes Heinsoo2, Antti Vepsäläinen2, William Kindel1, Hsiang-Sheng Ku1, and Frank Deppe1,∥

  • *These authors contributed equally to this work.
  • †Contact author: michael.renger@meetiqm.com
  • ‡Contact author: jeroen.verjauw@meetiqm.com
  • §Contact author: nicola.wurz@meetiqm.com
  • ∥Contact author: frank.deppe@meetiqm.com
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Phys. Rev. Research 8, 013148 – Published 11 February, 2026

DOI: https://doi.org/10.1103/8x68-cx1w

Abstract

In this work, we introduce a superconducting quantum processor architecture that uses a transmission-line resonator to implement effective all-to-all connectivity between six transmon qubits. This architecture can be used as a test bed for algorithms that benefit from high connectivity. We show that the central resonator can be used as a computational element, which offers the flexibility to encode a qubit for quantum computation or to utilize its bosonic modes that further enables quantum simulation of bosonic systems. To operate the quantum processing unit (QPU), we develop and benchmark the qubit-resonator conditional Z gate and the qubit-resonator MOVE operation. The latter allows for transferring a quantum state between one of the peripheral qubits and the computational resonator. We benchmark the QPU performance and achieve a genuinely multiqubit entangled Greenberger-Horne-Zeilinger state over all six qubits with a readout-error mitigated fidelity of F|ψ〉GHZ=0.86.

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Phys. Rev. Research 8, 013148– Published 11 February, 2026
  • Received 22 April 2025
  • Revised 29 September 2025
  • Accepted 5 December 2025
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