K. Watanabe

Search for Dark Photon Dark Matter of a Mass around 36.1 μeV Using a Frequency-tunable Cavity Controlled through a Coupled Superconducting Qubit

  1. K. Nakazono,
  2. S. Chen,
  3. H. Fukuda,
  4. Y. Iiyama,
  5. T. Inada,
  6. T. Moroi,
  7. T. Nitta,
  8. A. Noguchi,
  9. R. Sawada,
  10. S. Shirai,
  11. T. Sichanugrist,
  12. K. Terashi,
  13. and K. Watanabe
We report the results of a search for dark photon dark matter using a cavity that employs a transmon qubit as a frequency tuning component. The tuning mechanism utilizes the energy
level shift (Lamb shift) arising from the mode mixing between the qubit and the cavity mode. This method offers several advantages: (i) it does not introduce physical thermal noise from the tuning mechanism itself, (ii) it avoids electromagnetic leakage typically associated with cavity seams, and (iii) its implementation is straightforward. We excluded the dark photon parameter region for a dark photon mass around 36.1 μeVwith a peak sensitivity of χ∼10−12 over the mass range [36.0791,36.1765] μeV, surpassing the existing cosmological bounds.
arxiv pdf