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On-demand transposition across light-matter interaction regimes in bosonic cQED

Author

Listed:
  • Fernando Valadares

    (National University of Singapore)

  • Ni-Ni Huang

    (National University of Singapore)

  • Kyle Timothy Ng Chu

    (National University of Singapore
    Horizon Quantum Computing)

  • Aleksandr Dorogov

    (National University of Singapore)

  • Weipin Chua

    (National University of Singapore)

  • Lingda Kong

    (National University of Singapore)

  • Pengtao Song

    (National University of Singapore)

  • Yvonne Y. Gao

    (National University of Singapore
    National University of Singapore)

Abstract

The diverse applications of light-matter interactions in science and technology stem from the qualitatively distinct ways these interactions manifest, prompting the development of physical platforms that can interchange between regimes on demand. Bosonic cQED employs the light field of high-Q superconducting cavities coupled to nonlinear circuit elements, harnessing the rich dynamics of their interaction for quantum information processing. However, implementing fast switching of the interaction regime without deteriorating the cavity coherence is a significant challenge. We present an experiment that achieves this feat, combining nanosecond-scale frequency tunability of a transmon coupled to a cavity with lifetime of hundreds of microseconds. Our implementation affords a range of useful capabilities for quantum information processing; from fast creation of cavity Fock states using resonant interaction and interchanging tomography techniques at qualitatively distinct interaction regimes on the fly, to the suppression of unwanted cavity-transmon dynamics during idle evolution. By bringing flux tunability into the bosonic cQED toolkit, our work opens up the possibility to probe the full range of light-matter interaction dynamics within a single platform and provides valuable pathways towards robust and versatile quantum information processing.

Suggested Citation

  • Fernando Valadares & Ni-Ni Huang & Kyle Timothy Ng Chu & Aleksandr Dorogov & Weipin Chua & Lingda Kong & Pengtao Song & Yvonne Y. Gao, 2024. "On-demand transposition across light-matter interaction regimes in bosonic cQED," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50201-7
    DOI: 10.1038/s41467-024-50201-7
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