A1 Refereed original research article in a scientific journal
Characterization of a quantum bus between two driven qubits
Authors: Hijano, Alberto; Lyyra, Henri; Muhonen, Juha T.; Heikkilä, Tero T.
Publisher: American Physical Society (APS)
Publication year: 2025
Journal: Physical Review Research
Article number: 043339
Volume: 7
eISSN: 2643-1564
DOI: https://doi.org/10.1103/y648-4111
Publication's open availability at the time of reporting: Open Access
Publication channel's open availability : Open Access publication channel
Web address : https://doi.org/10.1103/y648-4111
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/508167864
We investigate the use of driven qubits coupled to a harmonic oscillator to implement a root iSWAP gate. By dressing the qubits through an external driving field, the qubits and the harmonic oscillator can be selectively coupled, allowing for the measurement of individual qubit states, as well as leading to effective qubit-qubit interactions. We compare the qubit readout on bare and dressed qubits, and demonstrate that when coupled to low-frequency resonators, dressed qubits provide a more robust readout than bare qubits in the presence of damping and thermal effects. Furthermore, we study the impact of various system parameters on the fidelity of the two-qubit gate, identifying an optimal range for quantum computation. Our findings guide the implementation of high-fidelity quantum gates in experimental setups, for example, those employing nanoscale mechanical resonators.
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Funding information in the publication:
This work was funded by the Research Council of Finland (Projects No. 354735, No. 321416, and No. 359240) and the European Research Executive Agency (Grant Agreement No. 101202316). We acknowledge grants of computer capacity from the Finnish Grid and Cloud Infrastructure (persistent identifier urn:nbn:fi:research-infras-2016072533). This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 852428).
