A Superconducting Qubit-Resonator Quantum Processor with Effective All-to-All Connectivity
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 which 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 multi-qubit entangled Greenberger-Horne-Zeilinger (GHZ) state over all six qubits with a readout-error mitigated fidelity of .
Cite
@article{arxiv.2503.10903,
title = {A Superconducting Qubit-Resonator Quantum Processor with Effective All-to-All Connectivity},
author = {Michael Renger and Jeroen Verjauw and Nicola Wurz and Amin Hosseinkhani and Caspar Ockeloen-Korppi and Wei Liu and Aniket Rath and Manish J. Thapa and Florian Vigneau and Elisabeth Wybo and Ville Bergholm and Chun Fai Chan and Bálint Csatári and Saga Dahl and Rakhim Davletkaliyev and Rakshyakar Giri and Daria Gusenkova and Hermanni Heimonen and Tuukka Hiltunen and Hao Hsu and Eric Hyyppä and Joni Ikonen and Tyler Jones and Shabeeb Khalid and Seung-Goo Kim and Miikka Koistinen and Anton Komlev and Janne Kotilahti and Vladimir Kukushkin and Julia Lamprich and Alessandro Landra and Lan-Hsuan Lee and Tianyi Li and Per Liebermann and Sourav Majumder and Janne Mäntylä and Fabian Marxer and Arianne Meijer - van de Griend and Vladimir Milchakov and Jakub Mrożek and Jayshankar Nath and Tuure Orell and Miha Papič and Matti Partanen and Alexander Plyushch and Stefan Pogorzalek and Jussi Ritvas and Pedro Figueroa Romero and Ville Sampo and Marko Seppälä and Ville Selinmaa and Linus Sundström and Ivan Takmakov and Brian Tarasinski and Jani Tuorila and Olli Tyrkkö and Alpo Välimaa and Jaap Wesdorp and Ping Yang and Liuqi Yu and Johannes Heinsoo and Antti Vepsäläinen and William Kindel and Hsiang-Sheng Ku and Frank Deppe},
journal= {arXiv preprint arXiv:2503.10903},
year = {2025}
}