Superconducting qubit-resonator quantum processor with effective all-to-all connectivity
Michael Renger, Jeroen Verjauw, Nicola Wurz, Amin Hosseinkhani, Caspar Ockeloen-Korppi, Wei Liu, Aniket Rath, Manish J. Thapa, Florian Vigneau, Elisabeth Wybo, Ville Bergholm, Chun Fai Chan, Bálint Csatári, Saga Dahl, Rakhim Davletkaliyev, Rakshyakar Giri, Daria Gusenkova, Hermanni Heimonen, Tuukka Hiltunen, Hao Hsu, Eric Hyyppä, Joni Ikonen, Tyler Jones, Shabeeb Khalid, Seung-Goo Kim, Miikka Koistinen, Anton Komlev, Janne Kotilahti, Vladimir Kukushkin, Julia Lamprich, Alessandro Landra, Lan-Hsuan Lee, Tianyi Li, Per Liebermann, Sourav Majumder, Janne Mäntylä, Fabian Marxer, Arianne Meijer - van de Griend, Vladimir Milchakov, Jakub Mrożek, Jayshankar Nath, Tuure Orell, Miha Papič, Matti Partanen, Alexander Plyushch, Stefan Pogorzalek, Jussi Ritvas, Pedro Figueroa Romero, Ville Sampo, Marko Seppälä, Ville Selinmaa, Linus Sundström, Ivan Takmakov, Brian Tarasinski, Jani Tuorila, Olli Tyrkkö, Alpo Välimaa, Jaap Wesdorp, Ping Yang, Liuqi Yu, Johannes Heinsoo, Antti Vepsäläinen, William Kindel, Hsiang-Sheng Ku, Frank Deppe
DOI 10.1103/8x68-cx1w · Physical Review Research
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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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